Your comment makes no sense. You can already export all the keys Protonmail generates (which I don't want to use and neither should I be forced to use). Not allowing the user to use their own provides absolutely no resistance to any kind of exfiltration.

>> Proton says they care about security and privacy but at the same time makes it impossible to use your own keys or properly export the original emails from your inbox. I really can't take this suggestion seriously.

They shamefully don't care about security and privacy because you can't get anti privacy capabilities working to your satisfaction.

You apparently could have lead with a lot of valid complaints but your 'shame' isn't really consistent with what you actually want.