That all depends on how you define what is "abuse" and what is simply good playing style within the terms and conditions.
If a player bets all on a big bet that is in the list of excluded games, then grinds
WR, that can be considered "bonus HUNTING", and would be a breach of your terms by playing an excluded game.
If, however, the player played only the games allowed with the bonus, but had a good run & the sense to withdraw while ahead, but having completed
WR, then confiscation of winnings would be reneging on a valid bet, what is meant by "stealing" by the casino in this context.
If the bonuses are non-cashable as with many Playtech offerings, then the only way they can be manipulated is by placing a single large bet on a 50/50 game and grinding out
WR if the bet wins.
If players open more than one account to take more bonuses than allowed, this would also be justification for removal of winnings, provided you can prove the case.
Many casinos confuse "bonus abuse" with skillful play, they are NOT the same, and any casino that voids winnings simply because a player played well, but within the terms of the offer, is "stealing", or reneging on a bet - something that in the days of the wild west in the USA would have got you shot!
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