To deal with multiple accounts, I don't think reducing promotions is the right solution, maybe they can implement identity verification for accounts suspected of abusing promotions. I have seen several casinos reducing their promotions or tightening the terms of promotion, and as a result the casinos lost a lot of players and closed.
But if those suspected accounts comply to verification, will the casino released their winnings? If I am the owner I won't do it but it's good if the abuser will fall for the bait and reveal himself. I can use this to sue him later on. We need to stop them because they can also do this to other casinos. The abusers are a cancer to the business owners which operates fairly and legally.
There are other things that are important other than promotions, this makes the loyal customers stay on a casino even if the casino cut down some of its promotions. I think new casinos have a reason on why they came up with a low requirement. Maybe that is to attract users and after it, they can tighten it a little bit.
Of course all casinos want to stop it, but how? I haven't seen a better solution than asking for identity verification to handle those multi-accounts
When they tighten the requirements, the casino will lose its players, and they will come back like a new casino without players