Comment by drpossum

You should back up your claim of "they have all the keys", because for things like email and file contents they claim they cannot decrypt them because they do not have those keys (which you have said they do).

I believe it was stated on the page you copied those stats from https://proton.me/legal/transparency

> As stated in our Privacy Policy, all emails, files and invites are encrypted and we have no means to decrypt them.