Protonmail is cop friendly. Any reasonable privacy aware email provider would hash the secondary email, not store it as cleartext. I implemented secondary email hashing for Riseup to prevent exactly this thing, over a decade ago.

https://restoreprivacy.com/protonmail-discloses-user-data-leading-to-arrest-in-spain/

Proton Mail Discloses User Data Leading to Arrest in Spain

Proton Mail came under scrutiny for its role in a legal request by the Spanish authorities leading to the identification and arrest of a user.

RestorePrivacy
Also, WTF logging IP addresses?! I don't know about Swiss law, but at least in the US if you design your system so that you can't gather certain data you can't be compelled to re-engineer it to gather that data just because the cops want it. That is what the whole FBI versus Apple case was about, and the FBI backed down rather than lose in court

@elijah i was shocked i just saw their response to the IP address leak and they literally said:

The Internet is generally not anonymous, and if you are breaking Swiss law, a law-abiding company such as Proton Mail can be legally compelled to log your IP address.

the direct statement that they are legally compelled to log IP addresses is an absurd fucking thing to bury halfway in the middle of the post!!!

Important clarifications regarding arrest of climate activist | Proton

We would like to provide important clarifications regarding the case of the climate activist who was arrested by French police.

Proton