Centralised exchanges are a central part of the bitcoin ecosystem so if they're surrendering their users to American regulation they'll see smaller profits. If they push them away they'll use decentralised exchanges setting a different way to trade so it's going to hit their profits.
I think that these exchanges are going to risk losing a part of their clients if that's what it takes to be able to transact in the country.
What choice do they really have? Give up users or shut down. They can also fight the government in court but that could take time and be expensive. Only the biggest exchanges will try this.
Do you think the governments don't know it that people will run away from centralized exchanges if they start sharing information about every transaction with the IRS and other 3 letter agencies?
It's great news for them because less legit exchanges means less legitimacy for the crypto ecosystem and slower adoption. In other words less competition for CBDC.