Yeah I'm almost positive they're encryption at proton mail is what the government was complaining about saying they can't break it for terror stuff and demanding back door access, but haven't been givin it and another company was really good to but decided to shut down before letting government pressure to gain access. More than we can say for hush mail / cyber-right who handed government the keys and full access to user emails.With that said though it is pretty fucked up if terrorist can't be tracked , so I guess it's a catch 22 to some degree