Earlier quoted context omitted.
Allow users to blacklist sites. Share blacklisted sites. Have the option of instead of hiding blacklisted sites entirely - show them in a different column. Have 4 different types of list. Whitelist - highest scoring Not listed - these websites are not ranked. Yellowlist - show but keep in a separate column Blacklist - don't show https://search.brave.com/help/goggles is interesting.
99%+ of people wouldn't use this, they would just try the search engine, see that the results suck, then stop using it. It could be useful for power users, though.
SEO is basically another form of advertising, so evidence suggests to me that people would use something like this.
[1] https://en.wikipedia.org/wiki/Ad_blocking#:~:text=users
[2] https://earthweb.com/how-many-people-use-ad-blockers/
[3] https://www.insiderintelligence.com/insights/ad-blocking