Bonus abuse involves deliberately taking advantage of opening bonuses for the purposes of generating too much site credit. For example, a sportsbooks operator that offers a free $50 bet for a selected market can be taken advantage of if a bonus abuser bets in a market where there’s only one clear winner. Then, they use another account on another sportsbook app and use both accounts to bet on opposite sides.
Since one side wins by default, the process repeats and the player repeatedly makes new accounts to get free betting money to make a modest profit on every wager.
To avoid bonus abuse, don’t constantly make new sportsbook accounts to receive more opening bonuses. Just use the bonuses as intended and you won’t draw the eyes of regulating authorities.