Say it a fourth time if you want to continue feigning ignorance. You’re assuming that the only way your credentials could be compromised is if your password manager it compromised. 2FA would not protect that specific use case if you store both authentication methods in your password manager. However, it does still protect your services from other types of compromises, which is better than no 2FA at all.

It does. You need both. Even if you have cookies disabled, Gmail can read all of your emails and use that information.

I remember when the Chick-fil-A CEO got a lot of flack. While I disagree with him, I still eat at CFA. Until I feel like the quality of the service is or will be compromised, I do not plan on migrating off of Proton.

One reason is to prevent targeted advertisement.

Forgive my ignorance, but this is false isn’t it? The target service can be compromised including your password, but not the 2FA (at least not longer than 30s). It’s still 2FA even if both authentication methods are stored on a single, centralized service. Obviously, not great, but definitely better than no 2FA.