It seems to me an alternative way to protest the Age Verification laws, at least in California and Colorado, is to stop creating user accounts at all. If there's no account setup, nor any account holder, these laws don't clearly apply.

Why does your OS need to know anything about you at all? You might want a PIN or passphrase to keep your computer locked, and you might log into some accounts from the web browser, but there's almost no value in an OS storing any personal details about you.