"KYC" and "mixers" in the same sentence makes it sound like an oxymoron.
Agreed.
There is a mixing technique which is 100% KYC- free, namely JoinMarket.
This is in fact a decentralized mixer that works on the maker-taker principle. Makers provide liquidity for mixing while takers consume it.
One can act as both a maker and a taker at the same time, and earn money.
Commissions depend on the filling of the order book and market conditions.
A good interface for JoinMarket is Jam.
Current order book: