Careful now, citizen! You've just expressed an opinion which is out of line with the Official Acceptable Opinions Manual^TM of the Central Chain Analysis Database. All your addresses will be blacklisted for 7 days in order to give you time to thoroughly reread the manual and reeducate yourself as to what is acceptable public speech. We trust this won't happen again!

But there is no incentive for an exchange to do so. Each exchange knows they can ask ridiculous KYC and that they can arbitrarily freeze or steal some users' coins, because every other centralized exchange is doing it too. They'll only start paying attention when they start losing business to DEXs or peer to peer trading. But with the general growth of bitcoin, for ever users which leaves a centralized exchange to use non-KYC trading methods instead, two more newbies come along and sign up without realizing they are sacrificing everything that bitcoin stands for.

There are indeed exchanges which rightly completely ignore any taint nonsense, such as Bisq and LocalCryptos, and coinjoin implementations such as JoinMarket. Perhaps we could also start a whitelist of online businesses such as gift card sellers which are known to pay no attention to taint and freely accept mixed or coinjoined coins, etc.