Aside from being caught and freeze all the account. I think it’s useless because casino welcome bonus often have a high wagering requirements which is extremely hard to complete.
You can add the max win on the bonus set by some casino as extra hurdle to avoid being abused the bonus by multiple account users.
Casino is prepared on worst case scenario.
Exactly, play reasonably, deposit reasonably, and don't target bonuses for us to use, it will become better options for us to stay playing with save. Because, if we are not a gambler with a lot of money, there's no reason in chasing these bonuses. We might feel this is unfair, but almost all bonus models come with "terms and conditions." If we feel can't meet the TnC, just let it go. Even if we are losing that bonuses, it's not a loss for us.
Sometimes, when we receive a bonus, the requirements are different than usual. For example, the withdrawal amount may be different. For example, the minimum withdrawal is $50, but because we received or claimed a previous bonus, the minimum withdrawal is usually higher than usual. I've experienced this, and it bothered me a bit because of the requirements. Unlike my friend, who usually gambles, he looks for casinos that offer bonuses to their players. I once asked him why he did this, as the bonus he received increased his gambling capital.
I don't think everyone is happy with bonuses that usually come with additional requirements. I've experienced this myself, wanting to satisfy my curiosity, but things didn't go as planned because there were always additional requirements even after I'd met the initial requirements.