I've always wondered why Google doesn't have some way to provide an explicit signal from the users like favorite/bookmark or explicitly like/dislike a search result.
It's often pretty fustrating to try and find something you know you've seen before but don't remember quite the name of or exact keywords.
Google added some "plus" button when Google+ was pretending to be a thing. It made no sense though as how would someone know it's a good result before they visit it?
Brave browser uses "attention" as the main factor. It's currently used for their paying the content creators and charging for ads, but with their new search engine [0] it may be a factor there too.
It's often pretty fustrating to try and find something you know you've seen before but don't remember quite the name of or exact keywords.