> ProtonMail is a well-known and well-regarded mail service and is often recommended to users looking to distance themselves from Google's less-than-ideal security practices. Unfortunately, however, ProtonMail was recently forced to cooperate with Swiss authorities in providing user data (date of account creation), which was subsequently handed over to American security authorities and enforcement agencies.

and

> Proton reached out to us to confirm that the only data provided to Swiss authorities was the date of account creation. [1]

[1] https://proprivacy.com/privacy-news/protonmail-authorities-u...