Google auth is good to have, but local auth should always be an option. It's not really good practice to exclude those who don't wish to cede control of their online life to Google.
And if your Google account is ever blocked because you triggered an AI security flag, you will lose access to all the sites where you signed in with Google.
I find the need to self-moderate at least as scary. Heaven forbid you say what you think with just morality in mind. Who even knows what is or isn't allowed in 2024?