It's interesting you say that, because for me personally, security is one of the main benefits of a Google account.
If this is the main motivation here then I would look into Google's advanced protection program that allows you to lock down your account with two Yubikeys and disables all other forms of 2FA.
As far as I'm aware, you still can't use a YubiKey to secure a Proton Mail account.
If this is the main motivation here then I would look into Google's advanced protection program that allows you to lock down your account with two Yubikeys and disables all other forms of 2FA.
As far as I'm aware, you still can't use a YubiKey to secure a Proton Mail account.