More on that here: https://proton.me/blog/climate-activist-arrest

They swiftly went on to win a court ruling that would prevent this specific situation from repeating. https://proton.me/blog/court-strengthens-email-privacy

They only have to comply with Swiss courts, but they're pretty up front about what they can and can't do, including suggesting Tor for anonymity, and the difference between Mail and VPN in Switzerland (VPN is no logs).