But that doesn't require a disclaimer, if anything that just requires you to not claim to be a lawyer. Additionally: what recourse does someone have even if they read a random internet comment as legal advice. Pretty much zero.

Lay people can comment and give their opinions on matters of law. They just can't claim to be or represent themselves as a lawyer if they're not.

Of course that opinion is worth the paper it's printed on.

I am not a lawyer.