have you ever checked them?
could you point me to where any of them proves that Proton isn't actually collecting any data?
because I am only reading about penetration tests and such, which only tell me that their software is reliable against attackers, but that is not the point of the discussion.
also it seems there is no audit for their AI assistant at the link you provided.
more private than what? which features are you looking for?
there are potentially many apps for it, but the question needs to be more specific.