Also for VPN providers, and their customers. And generally for people who want to buy stuff and lease online services ~anonymously. If one mixes well enough, that is.
Most mixers use CoinJoin, which gives you trustless assurances that you won't lose your money. The worst thing you'll lose is your time.
There is the concern that you'll end up with Bitcoin that's been tainted in one way or another. However, at least some mixing services get coin from miners, so it's clean. And you can check for that in the blockchain.
That's mostly a concern when you're mixing Bitcoin before converting it to meatspace fiat. If you're anonymizing Bitcoin purchased with meatspace fiat, it doesn't matter so much if some is tainted. Or at least, it won't unless tainted coin gets blacklisted.
Just a thought
But no matter how you get the Bitcoin, you can get whatever degree of anonymity you want, by mixing it many times. You mix via Tor and nested VPN chains, with a different Whonix VM and mixing service for each mix.
From there, send your coins through a samouari whirlpool https://samouraiwallet.com/whirlpool
Then send them wherever you like.
There is still some counterparty risk (what if you're buying coins from the CIA, or whatever), but it's almost minimal.
Buying coins from a Bitcoin ATM is even easier, if there's one near you.
Enjoy those massive fees!