I think curation by paying users could work. At least it would make manipulation quite expensive. Let people downvote/upvote search results as an extra strong

I think curation by paying users could work. At least it would make manipulation quite expensive. Let people downvote/upvote search results as an extra strong signal on top of monitoring what they choose to click on in the result list. Also let people block domains from searches and provide some discoverability of commonly blocked domains.