This is non-news, like all tech companies, they are bound by law to do this. It happens more than 6000 times per year for Proton. However, this user just had bad opsec. Proton emails are all encrypted and cannot be read unless law enforcement gets your password, which Proton does not have access to. Even if Proton hands over all data.
Proton’s mails are encrypted… between proton accounts. Send an email to a hotmail account and bye-bye encryption. Proton does rely on PGP so you can use that if the recipient supports it.
Mail stored in proton is encrypted
https://proton.me/support/password-protected-emails
A Password-protected Email is an email that requires a password to open it. It’s a way you can send a secure, end-to-end encrypted email to anyone who isn’t on Proton Mail.
They mean encrypted at rest. As in, Proton cannot hand over a copy of all your emails to a law enforcement agency, they don’t have access.
This means law enforcement would have to capture an unencrypted email in transit, or obtains your emails from either recipient individually.