The UK’s online gambling market, which once resembled a structured entity with distinct segments for sports betting, poker, bingo, and slots, has seen a significant shift in recent years. A parallel, unregulated market has emerged, capturing around 9% of the online gambling activity in the UK, with a staggering £379 million generated in just the first half of 2025. This surge is not merely a result of cost-conscious bettors seeking offshore alternatives; it is a sophisticated operation leveraging targeted marketing, strategic affiliate networks, and a deep understanding of regulatory loopholes.
By 2020, the illegal gambling market in the UK was almost negligible, contributing less than 0.5% to the total industry. However, a combination of factors—including the normalization of VPN usage, cryptocurrency transactions, and a robust affiliate ecosystem—has fueled its growth. Data from intelligence providers now indicates that illegal operators manage approximately 9% of the market, driven by around 700 unlicensed brands and supported by over 1,600 affiliates who mimic regulated platforms without incurring the costs of compliance, licensing, or UK taxes.
A significant portion of this growth is attributed to targeting vulnerable groups, such as individuals under 18 and those who have self-excluded from gambling. Analysts estimate that self-excluded players alone have contributed to hundreds of millions in losses, with the total illegal market potentially reaching £600 million when including underage losses.
Frontier Economics, analyzing cash flows for the industry’s standards body, estimates that roughly 1.5 million Britons engage in illegal gambling, wagering up to £4.3 billion annually, split between online platforms and physical underground venues. Their research highlights that one in five bettors aged 18–24 has explored the black market, indicating that the pathways leading youth to these illegal options are not fringe but rather mainstream.
The illegal market’s strategy does not rely on outperforming licensed operators in terms of odds or user experience. Instead, it capitalizes on areas where regulatory compliance creates friction. For instance, searches for terms like “not on Gamstop” and “betting with crypto UK” lead users to curated lists of offshore brands. The utilization of short-form videos and messaging apps like Telegram and Discord wraps promotional content in an engaging format, while lookalike sites quickly replace those that are blocked, maintaining their presence and authority.
The onboarding process for these illicit sites is streamlined, with minimal Know Your Customer (KYC) requirements, friendly registration flows for VPN users, and payment systems designed to obscure jurisdiction and ownership. Branding that explicitly states “Not on Gamstop” serves as an invitation to those seeking to bypass self-imposed gambling restrictions.
Retention strategies are equally aggressive, employing bonuses with complex re-wagering requirements and encouraging cross-selling into high-risk gaming options to maximize losses. Affiliates continuously reactivate users through temporary domains whenever payment or hosting issues arise.
This approach works due to its superior unit economics; funds that would typically be allocated to compliance and statutory contributions are redirected towards customer acquisition and retention. As a result, the illegal market thrives, while the legal market faces increasing challenges.
There are two prevailing narratives within the industry regarding the growth of the black market. The harm-centric perspective suggests that illegal operators are exploiting vulnerabilities, particularly targeting children and self-excluded adults because these are the easiest conversions with the weakest controls. Conversely, the friction-centric view argues that the proliferation of the black market is a byproduct of regulatory measures introduced since 2018, such as stringent AML checks and stake caps, which have complicated the legal gambling experience, driving some consumers to seek out more seamless, albeit illegal, alternatives.
Both perspectives hold truth. The evidence indicates that while the illegal market actively targets the excluded, it also benefits from the increasing complexities within the legal market. Policymakers who focus solely on one narrative risk implementing solutions that either inadvertently penalize legitimate operators or fail to address the predatory practices of illegal entities.
The financial implications of this split market are substantial. Public finances could suffer a shortfall of up to £335 million over a parliamentary term due to duty leakage. Sports and cultural sectors, heavily funded by regulated operators, stand to lose significant monetary support as illegal brands do not contribute despite monetizing fan engagement. Furthermore, consumers often remain unaware of the unregulated nature of these sites, leaving them vulnerable with no access to complaint mechanisms or guarantees of fair play.
To address these challenges, the UK Treasury has proposed a tax overhaul consolidating three existing online gambling taxes into a single Remote Betting & Gaming Duty (RBGD). This reform aims to simplify tax filings for operators and modernize the tax framework, maintaining a focus on consumption-based taxation and closing existing loopholes. While the tax itself won’t eliminate offshore competition, the chosen rate will influence how competitively the regulated market can price its offerings and invest in safer gambling measures. A misalignment in the tax rate could widen the friction gap that illegal markets exploit.
Enforcement needs significant improvements. Current search and social distribution mechanisms still allow for the promotion of unlicensed brands, and while some progress has been made in redirecting harmful searches to support resources, enforcement remains slow. Proposed fixes include permanent blacklists for repeat-offending affiliates, advertising sanctions tied to real identities, and clear licensing labels for users.
Internet Service Providers (ISPs) and hosting platforms require a more proactive approach to blocking unlicensed sites. A higher frequency of blocking orders, akin to anti-piracy measures, and incentivized pre-screening for UK-facing traffic could enhance enforcement effectiveness.
Payments and cryptocurrency processes also serve as pivotal areas for intervention. While card processors have improved, alternative payments and crypto remain vulnerable. Data-sharing agreements between regulatory bodies and financial institutions could help identify and penalize those facilitating illegal gambling.
In addressing affiliate marketing, targeted legal exposure for UK-based entities promoting unlicensed sites is necessary. A publicly accessible register for licensed affiliates could verify legitimacy and deter uncertified promotions.
Internally, onshore regulations must evolve to ensure that mainstream bettors feel protected rather than policed. Risk-based affordability checks should focus on genuine markers of harm, and bonus rules should be clear and competitive to neutralize the appeal of illicit alternatives.
The proposal to align the treatment of promotions under a single duty would close existing loopholes that allow for promotional arbitrage. By standardizing how free bets and non-cash prizes are accounted for, the legal market can provide more transparent and fair offerings.
The journey into the illegal market for young adults is increasingly facilitated by modern content creators and closed groups rather than traditional ads. Platform-level interventions to limit the reach of illegal content and promote licensed options are crucial. Educational initiatives at the point of search can also redirect potential users towards harm-reduction resources.
The impact on sports, heavily funded by the legal gambling sector, is significant. As spending shifts to offshore sites, the financial support for leagues diminishes, weakening their bargaining power and potentially leading them toward less scrupulous commercial partnerships.
Looking ahead, the next two to three years present various scenarios: a balanced approach to tax and enforcement could stabilize the illegal market’s share, while excessive taxation and insufficient enforcement could exacerbate current trends. Immediate actions that do not wait for the 2027 timeline include platform contracts with mandatory license checks, expedited ISP blocking, an affiliate register, and payment and crypto monitoring.
Ultimately, the UK’s battle against the rapidly growing black market in online gambling calls for a comprehensive approach. This includes platform accountability, strict affiliate liability, disruption of payment routes, and refined regulations that protect vulnerable individuals without complicating the legal gambling experience. Only by addressing these areas can the legal market regain its footing and become the preferred choice for consumers.
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