I generally trust Proton products.
As a side note, you should never use any non e2e encrypted password manager.
this post was submitted on 16 Aug 2023
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As a rule of thumb, do not put all your eggs into one basket. No software is infallible and vulnerabilities can be uncovered and exploited in both open and closed sourced applications.
That’s being said, as long as you don’t store all information necessary for a successful login in your password manager, you should be fine.
So storing credentials for your bank account is fine, as long as it is also protected by MFA and you do not use the same password manager for handling that.
You can store PIN codes from your debit cards in the password manager as long as you do not store card number / expiration / CVV2 there too.
Personally, I keep passwords in a password manager, MFA tokens in a separate authenticator, MFA recovery codes go to FIPS 140-2 certified encrypted USB sticks (3 separate copies). I do store debit card PIN codes in my password manager, but only alongside the last 4 digits of the card number.
It‘s e2ee and open source, so I‘d be not concerned regarding Proton‘s side.
Keep your Account safe, your passwords long and complex and use 2FA sort of things and you should be fine, I‘d say