Well, if a casino has setup their wagering requirements TOO LOW, then that is their misfortune/loss if a player follows the rules and uses the free bonuses (welcome bonuses, reload bonuses, birthday bonuses, vip club bonuses, no deposit bonuses etc.) to play and win enough to withdraw the winnings.
without getting too technical (boring), most casinos have properly calculated the game odds and then set their bonus wagering requirements and game weight factors so that a player has to be very very ‘lucky’ with a ‘winning streak” (short term wins that are contrary to statistical game expectations) in order to gain an ‘advantage’ and win.
The aforementioned $25 no deposit poker bonus is a good example. I also previously personally experienced such a win on a no deposit slot bonus. These instances are real and they are actual cases of players ‘beating the casino’ fairly. But, they are by no means ‘bonus abuse’, they could be more aptly called ‘bonus use’. This is also what the ‘mathematically challenged’ player is trying to do when they go after and accept these bonuses.
If a casino voids wins from a legitimate win such as that when the player follows the T&C’s, then they themselves are ‘not playing fair’ and should be called ‘bonus abusers’. If they don’t want these type of players then maybe they should do a little truth in advertising and just say “only stupid players allowed” or “If you lose, ha ha sucker” or “if you win, you must be a cheat”.