How can that ever work in a world filled with people that are eager to lie to you?
Since most people don't write anything on the internet, I can pay people $5 to use their signature and operate a "sign farm".
Look at the effort these people go though to send their spam.
I’m hoping for a “this human being validated this message”. I think that alone could solve multiple problems.
If you put your name on AI spam people will flag your post and no-one will bother to see your posts for at least a few years.