The whole 'taint community' (governments and their friends) will tell you those, as well as Lightning funds, are all tainted, because it's not sure that they come from a 'good, non-criminal origin'.
They are already doing it. They have been doing it for a LONG time. Deposit a mixed UTXO on any Centralized Exchange and they will question you and ask for documents. Same with Coin Join UTXO's. Or at least they did, until Wasabi started their censorship campaign.
They are already putting red flags on mixed coins and they're trying to scare people away from mixing. They want us to understand there is this difference between the good and the bad coins and they are differentiated by their history. Interestingly, they want the typical division you to see in politics.
And we will see more and more of this division and more of these bans until they get what they want. It is creepy. We are using mixers to preserve privacy and cut blockchain history off our coins and the outside world sees it as a way to exchange tainted for untainted. This is a LONG battle we have to survive until, if ever, most will change their perception. But long as there is an authority condemning mixers, there will be sheep that will listen and do as they say.
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Regards,
PrivacyG