AI content will be associated with a user or organization in the trust graph. If someone you trust trusts a user or organization who posts AI content, you're free to revoke your trust in that person or blacklist the specific users/organizations you don't want to see anymore.
We've been pretending to be just about to do this for decades. The fact is that internet companies will not develop a network of trust, because they are primarily advertisers looking for better ways to abuse trust.