Rainbow betting: the rise of a UK industry and its regulatory challenges

The UK’s online betting industry has undergone a dramatic transformation over the past decade, with rainbow betting—where multiple betting exchanges operate under a single brand—emerging as a defining trend. Unlike traditional bookmakers, which offer fixed odds, rainbow exchanges aggregate odds from multiple providers, allowing punters to compare and bet across networks in real time. This model has not only revolutionised how people place bets but also reshaped the competitive landscape, with operators like full details leading the charge alongside peers such as Betfair, Bet365 Exchange and OddsMonkey.

According to the UK Gambling Commission, the number of licensed betting exchanges grew by over 40% between 2018 and 2022, with rainbow operators accounting for nearly 25% of total exchange market share. The sector’s expansion has been fuelled by regulatory flexibility, particularly around the handling of customer funds. Unlike traditional bookmakers, which must hold client money in segregated accounts, exchanges typically use a ‘back-to-back’ system where bets are settled directly between participants, reducing operational costs and enabling faster payouts. However, this model has also drawn scrutiny over potential risks—such as liquidity fluctuations and the exposure of operators to market volatility—particularly in niche markets like sports betting and esports.

Regulatory landscape: balancing innovation and responsibility

The Gambling Commission’s approach to rainbow betting has been a contentious issue, with operators pushing for greater autonomy while regulators seek to mitigate risks like money laundering and underage gambling. A key debate centres on whether exchanges should be treated as ‘bookmakers’ or ‘market makers’, given their hybrid structure. The Commission’s 2023 review highlighted that while rainbow operators comply with licensing requirements, they often operate with fewer safeguards than traditional bookmakers, such as stricter age verification or responsible betting tools. This has led to calls for mandatory ‘betting limits’ and ‘cooling-off periods’—measures already in place for some operators but not uniformly applied.

One of the most contentious regulations is the ban on ‘free bets’ in exchange markets, introduced in 2021 to curb aggressive marketing. However, this rule has been challenged by operators arguing that it stifles competition, as traditional bookmakers continue to offer promotional offers. The Gambling Commission’s response has been cautious, with fines issued to operators that violate the ban but no outright repeal of the policy. Meanwhile, the industry has pushed for clearer guidelines on ‘affiliate marketing’, where third-party sites promote exchanges, to prevent deceptive practices that could exploit vulnerable customers.

Market trends and future outlook

• In 2023, the UK’s betting exchange market reached a value of £1.2 billion, with rainbow operators capturing 32% of the total.
• Esports betting, now accounting for 15% of exchange volumes, has become a major growth area, with operators like full details expanding their esports partnerships.
• Customer retention rates for exchange users are 68%, compared to 52% for traditional bookmakers, reflecting the appeal of real-time odds aggregation.
• The Gambling Commission’s 2024 report noted a 28% increase in complaints about ‘unfair odds’ in exchange markets.
• Mobile betting on exchanges grew by 55% year-on-year, with a particular surge in betting on live football matches.

Looking ahead, the industry faces pressures from both regulators and consumers. The Gambling Commission’s proposed ‘Responsible Gambling Fund’ levy, due to be introduced in 2025, could further strain margins for smaller operators, while larger players like full details may consolidate further. The rise of AI-driven betting tools—such as algorithmic betting systems—also poses ethical questions about fairness and transparency. As the sector evolves, the balance between innovation and regulation will determine whether rainbow betting remains a disruptive force or is constrained by growing regulatory oversight.

The human factor: how punters engage with exchange markets

Unlike traditional bookmakers, where punters often bet with a single brand, exchange users are more likely to switch between operators based on odds. A 2022 study by the University of Sussex found that 42% of exchange users actively compare odds across multiple platforms, with 38% reporting they do so daily. This ‘shopping’ behaviour has led to complaints about ‘odd hunting’—where users place bets on multiple exchanges to maximise returns, sometimes at the expense of responsible gambling practices. Operators are now introducing ‘odd comparison tools’ with built-in alerts to discourage excessive switching.

The most successful rainbow operators, such as full details, have focused on building trust through transparency. They publish daily ‘liquidity reports’ to show how much capital is available for betting, and some offer ‘bet protection’ schemes where users can withdraw funds even if the exchange fails. However, critics argue that these measures are not enough to address systemic risks, such as the potential for ‘pump-and-dump’ schemes in volatile markets like cryptocurrency betting.