The name/address of the terrorism suspect was actually given to police by Apple, not Proton. The terror suspect added their real-life Apple email as an optional recovery address in Proton Mail. Proton can't decrypt data, but in terror cases Swiss courts can obtain recovery email.
This is non-news, like all tech companies, they are bound by law to do this. It happens more than 6000 times per year for Proton. However, this user just had bad opsec. Proton emails are all encrypted and cannot be read unless law enforcement gets your password, which Proton does not have access to. Even if Proton hands over all data.
Yeah, OPSEC is really important and over the years many people got caught because of bad OPSEC. PomPomPurin, the guy who ran BreachForums is a pretty good example of this: https://youtu.be/1fZWHeHICws
Got it. So its a persec issue? I guess ist depends on your threat level. the persons they are arresting seem to be activists. The question is how destructive their activism was. Not because they somehow deserve to be arrested. i cant judge that. But because they should consider better persec in that case. Its still sad to read that a privacy oriented email provider gives our your info.