If you pay Proton Mail for a service, they may hand over the payment data in response to a court order: https://www.404media.co/proton-mail-helped-fbi-unmask-anonymous-stop-cop-city-protestor/
Proton Mail Helped FBI Unmask Anonymous ‘Stop Cop City’ Protester

A court record reviewed by 404 Media shows privacy-focused email provider Proton Mail handed over payment data related to a Stop Cop City email account to the Swiss government, which handed it to the FBI.

404 Media
@evacide I've been following the articles on this, and was curious -- you would know this better than I -- does it sound like they were in a position where they had a legal alternative?
@cliffle This is exactly what they have already said they would do, but it is very common for me to encounter people who use Proton Mail who do not expect this.
@evacide @cliffle I will admit to being surprised that they are required to log certain information by way of court order that they don't log by default.
@evacide @cliffle @stinerman There is a thin line on logging stuff for user debug (being an isp/supplier for friends, i have some clue, not pretending it's expertise), therefor where is that line. also, i might understand that proton needs to comply with swiss law (which isn't up to date vs data retention and digital data, because totally f*ing legacy.) my short swiss citizen view : we're in deep shit with this and local politics dont care. ( i'm geneva's former pirate party founder and lost)