Then why in twenty years of personalization am I still seeing junk ads? I don't want to hear about your drop-shipping or LLM wrapping business. The overwhelming majority of ads are junk. Yes, they bother me.

Because they are selling to the advertisers and their own imagination of their 'brand'. If the advertising customer base weren't stupid then 'advertiser friendly' wouldn't exist as they would be smart enough to realize that you won't offend people by advertising to content that they are watching for entertainment, or from people saying 'die'.