Hush mail and similar providers were supposed to be the go to private email back in the day. Turns out the FBI was running the servers for who knows how long.

I’ve had similar concerns about proton, looks like I’m not the only one.

https://www.wired.com/2007/11/encrypted-e-mai/

I don't know if he does, but I vouched for this flagged thread, as this is a Hacker site, and such allegations should be met or discussed at least.