It may have happened in 2021 but apparently it seems Proton handed over email related information including IP addresses to French authorities that requested them via a Swiss court. When that request arrived, the Swiss judge forced Proton to log and disclose the IP and browser fingerprint of a specific person. That basically is shocking even though they provided mitigation by saying they had no choice as it was a legal request they had to comply with. All that because the French authorities were seeking information on a climate activist.