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I don't think soo.
The bonus came from wagering, how the hell the person abuse that. He still need to wagger for receive the bonus, unless he buying a higher account to get more bonus but as we know is only matter of time can be banned/lock for the account.
Nothing to worry about the bonus mate.
Sometimes there are bonuses that don't require a high wager like pre-monthly if you have 4 Platinum accounts then you will claim $100
Actually Stake doesn't have a problem with bonuses like that , it's just that misuse can be a reason to implement KYC.
I'm sure it will be implemented but not for now maybe a few years regulations also force it.