As far as I understand, illegal mixers are those who are close by the regulators, just recently this year we've seen Bestmixer was close, so I think they are doing some illegal activities like money laundering. So to think that there's still a lot of mixers existing until now, I believe they complied with any regulatory compliance they have to or they maybe they are not regulated yet.
For me, using a mixer is kinda risky as any time they can disappear that's why I don't transact a big amount of BTC in one time, just to minimize the risk.
Sorry, but I don’t think you know what you are talking about.
Mixers complying with “regulatory compliances”? Regulated mixers? Illegal because they got shutdown?
A mixer receives coins and send coins. They don’t track, nor verify, nor “comply”. Do you even know what is the point of using a mixer? Why do they even exist?
What comes next? Mixers doing KYC? lol