I think those are some good points about ProtonMail:
"1. Only the content is encrypted, metadata such as subject lines are not encrypted, even though multiple email clients are compatible with encrypted subject lines exist (K9 Mail, Thunderbird, and a lot more) ProtonMail refuses to add support for this. ProtonMail has so much more metadata than the subject lines, its encryption really doesn't matter at this point. If you want encrypted email, you need to encrypt it yourself using a email client that doesn't send a whole bunch of metadata and GnuPG.
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Account info Recovery emails, login times, and much more is not encrypted and can be requested from ProtonMail at any time. It doesn't matter if its Swiss the Swiss courts will happily allow the request.
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OpSec - Probably the biggest problem ProtonMail serves as a security and/or privacy product which doesn't encourage good OpSec. Security is a process not a product. You can use ProtonMail over Tor, which is a good idea if you use ProtonMail, but there is a lot more stuff you have to do to not link it to your identity. ProtonMail doesn't encourage this process and doesn't mention it in any beneficial way, in fact they do the opposite encouraging you to link your identity to it. When you register a new account, they ask you to migrate emails from Gmail and even reward you for doing it, linking a Gmail address to your ProtonMail address, which is terrible idea. This ties in with my second point regarding account info.
Stop using ProtonMail."
Author: Mikoyan Gurevich, 05/16/24