There are several reasons why bet365 accounts can be restricted, including matched betting, unreasonable betting behaviour, GamStop (self-exclusion), and exploitation of bonuses.
Winning too much\n\n So, if you're on a lucky streak, you might find that Bet365 restricts the size of the bets you can place to avoid significant losses for the company. Similarly, if Bet365 suspects you are a professional gambler, they may restrict your account for the same reason.