I've seen mixers for altcoins in the past, but can't tell you if they're reliable.
There are plenty!!! ... but all of them are scams.
Interesting. I wonder what is ROI, daily/weekly volume etc in case of BTC mixers and how it is related to the market cap. Entry threshold? Do these numbers make altcoins mixers unprofitable or there is just no need for them? BCH has around only 0.5% of BTC market capitalization, but is it the answer?