What do you mean by blacklisted address? why would someone's wallet address be blacklisted and blacklisted from where? there is no such thing as blacklisted address (Unless I am unaware of something ) maybe you mean a wallet address which is linked to your identity.
It is an attempt by governments to control Bitcoin, which is to prepare banned lists so that when you deposit from those addresses to any popular cryptocurrency exchange, that account is frozen and your data is sent to the government. The government has also begun to force some mining pools to avoid confirming transfers that come from those addresses.
I don't think that is such a big issue. because people who trade manually which we call p2p know all these things. and there is nothing wrong with trading with someone with known address.
If you do not think it is serious, then the main reason for banning mixer campaigns in BTT was because sinbad signature campaign address added to OFAC list (part of the U.S. government), which means that deposits from the signature campaign to your account in platforms that support those lists, such as Binance, will be blocked, and some Binance accounts have already been banned.