Bookmakers use software and computer programs to manage their risks and players can quickly get flagged as potential risks to the bookmaker based on their betting and winning patterns. In the end, it leaves the player no other option than to leave the bookmaker and go somewhere else.
It influences the high-roller or professional gambler more, they tend to play higher stakes and make use of professional techniques and strategies to make more profitable bets. Account restrictions are an informal practice utilized by some bookmakers to prevent some players from winning too much money, this can range from closing an account or to limit the possible winnings by reducing the stakes offered to the lowest possible level.