if you are using your own index, I think you could use a more economical approach to fight the spam bullshit of the modern web.
instead of using badness enumeration, crawling everything and filtering malware, use an opt-in principle
have a community method of gathering new trusted websites
use websites internal search functions to get more results
use categories to split up the websites, reinventing what people should find: general, news, navigation, science, politics, IT, technology (not code), art, music, philosohy, ....
have an app or submission website where users can submit new websites, and some form of community control over it (kinda censorship but in a good way)
This could fix the web as it currently is, by rethinking what should be found, pushed etc. Rating websites by quality could also be helpful.
Also if you support payments in crypto or cash, there should be no problem to make it paid.