As far as I understand all this, offering mixing services will be illegal, but using such services will not be outlawed.
Using them is not outlawed because they can take down any service they want whenever they want. They want to see who is crazy enough to take that risk. They probably think, if this person desperately wants to mix his coins, he probably has something to hide, let’s check. Another thing is, they probably seize these mixing services way before they announce their involvement… just to collect more data. Using centralized mixing services never made any sense to me because of that.
Decentralized services will be available anyway. Not every dev lives in a country they can reach. Can they get to a dev that lives in Russia for example? I don’t think so but this time your data will be in the hands of Putin.
This however weakens the fungibility of bitcoin. The owners the coins that do not listen and mix their coins, they're coins might not be accepted by businesses, exchanges in the cryptospace and those
marked coins might have lower value in the market. Will everyone want to keep
marked coins in their wallets? Innocent or guilty, this will only give the government a reason to find a crime in your activities in the cryptospace. Another head shaking problem people who want to use bitcoin as a medium of exchange.