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 Glad that I paid them nothing while I was still using Proton Mail.
@Orca @evacide This actually how you avoid this issue…your credit card is tied to you, full stop. Either pay with an alternative method or not at all
@wonkothesane @evacide
I mean both.
Paying for something is definitely the fastest way for the cops to trace the payment back to me.
But also I don't want to give Proton money because they did this (multiple times), for ideological reasons.
@Orca That’s fine. But it’s also really disingenuous to claim Tuta, Fastmail, or any other hosting provider wouldn’t do this
@wonkothesane
They can become unable to do this if the mail provider just accept the payment - enable premium on that account - not save the payment information. (I don't know if that meets the requirements of law, though.)
But I guess recurring payment does exist because that would be bad for business otherwise. Or they just save the payment methods indefinitely.

@Orca With Proton you have the option of paying in crypto (this isn’t as untraceable as people pretend) and cash. But nothing is more tied to your identity than a credit card, and as you’re saying all companies are going to give you the option of renewing your sub via saved payment

Proton does not save your card info if you delete it

As much as I hate to blame users this really strikes me as an opsec issue on their part.

It’s a horrible situation but it sucks to see it sensationalized