Is there another edge to this sword? Can we fight back with LLMs that ignore sources with all the tracking / SEO and other garbage? I'd love to tell my local LLM that "I hate pintrest" for instance and it just goes "okay, pintrest shields are up".

Seconding the Kagi thing. You don't even need an LLM. If you search something like the term 'camping gear' search results pop up right away, no LLM response. However by each site's link is a little shield warning you about how many trackers and ads there will be on the page. Next to that is a lil kebob menu that lets you either boost the site or remove it from your search. That's also where their AI functionality is hidden. You can get a page summary or ask questions about that page.

If you'd rather the quick AI-summaries a la google you can put a question mark at the end of your search term. 'lawsuits regarding ferrets?'

And yeah as the sibling commenter pointed out, you can go into Kagi's preferences and explicitly rule out pinterest (or whatever site you want) from any of your searches for ever.

Kagi allows you to block Pinterest