Yeah, that’s the legwork you have to do. Honestly it’s probably not much legwork but if filters like this were more prevalent in say Google for example, it would turn into a cat and mouse game very quickly between search engine users and blogspam.

Yeah, I feel like the reason Kagi works is because google still delivers the majority of results to these sites. If Kagi one day becomes dominant, the filters will cease to work as you said.

It's more... about the user having that control, not the service provider. I would wager it would still work all the same.

Perhaps, some websites would stop being so hostile if they were considered as such and blocked by a higher percentage of users :)

you mean you don't like Pinterest search results?