A few things: I think the "average" proton user is super technical and cares about this thing, or they wouldn't use it in the first place. The threat model is

A few things: I think the "average" proton user is super technical and cares about this thing, or they wouldn't use it in the first place. The threat model is likely law enforcement - they can "compromise" a server legally and restrict owners from notifying people, and have done so many times in the past.