However, winning too often will see your account with bet365 restricted. This is why bookmakers don't like professional gamblers who consistently win. It is bad for business, and bookmakers are out to make money, not lose them.
Yes, bookmakers (or sportsbooks) have the right to limit or ban customers from their services, even if the customers are consistently winning bets. This practice is often referred to as "gubbing" or "restricting" players.