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.
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 Waxwing
Nico🦆
Proton