How Bookmaker Profiling Works
Soft bookmakers (the large European operators like Bet365, William Hill, Paddy Power, and similar) operate on a recreational bettor model. Their pricing is calibrated to extract margin from bettors who are less informed than they are, and their risk management system continuously monitors accounts to identify bettors who represent a threat to that model: people who bet at sharp prices, who take value consistently, and whose results suggest they know something the bookmaker doesn't.
The profiling is automated and runs continuously. Each bet you place adds data points: the odds at the time of your bet relative to the bookmaker's line, how quickly you bet after line movement, what markets you select, how your win rate compares to the expected model, and how your account compares to aggregate patterns for your segment. The system doesn't need a human to flag you ; the algorithm does it.
This is why you cannot simply "stay under the radar" indefinitely. The system sees every bet in context. A single big winner doesn't trigger limits. A consistent pattern of bets placed before the market moves against you, at odds that close lower than you bet, in markets with low margin : that is what the profiling system is looking for. And that pattern is exactly what a competent value bettor produces.
Understanding this is important because it explains why many of the commonly suggested tactics (cashout usage, betting on accumulators occasionally, placing some losing bets deliberately) are based on a misunderstanding of what the system actually measures. It is not measuring your win/loss ratio on a simple per-bet basis. It is modelling your betting behaviour against a sophisticated expected-value framework.