I guess that sadly many laws look at mixers more as crypto-money-washers than privacy tools.

That stated I guess it could be improbable to have  LEGAL consequences because it's improbable mixer owner will self-report its activity just to denounce you

But I would be personally worried about violent revenges if you do not hide your identity in a really effective way (which is soooo difficult in these days, especially if you haven't always cared about it, ideally since the beginning of times)

my2cents