Proton analyzed this revelation and found it doesn't impact Proton users due to the way that Proton's encryption and infrastructure works. While the reported practices have long been legalized in the US and Germany, they are very likely illegal in Switzerland and are therefore subject to legal challenge. It would not be entirely surprising if this got overturned by the courts. For example, Proton won a similar court case in 2021 (https://proton.me/blog/court-strengthens-email-privacy).

Deeper analysis on these revelations can be found here: https://www.reddit.com/r/ProtonMail/comments/1930vnh/comment....