I am pretty sure some regulation (at least in US) is in the picture for these type of exchanges/mixers as shapeshift seems to be making a move toward KYC.

https://cointelegraph.com/news/exchange-without-accounts-shapeshift-to-gradually-introduce-membership-program

Although Colorado has introduced some real exciting news for exchanges based in Colorado that don't rely on fiat.


https://www.newsbtc.com/2018/09/22/crypto-exchanges-dont-need-licenses-in-colorado-for-fiat-positive-development/