this is a very cool idea

i'm actually working at a paid gig right now building a matchmaking server back end for a recommendation/search engine for potentially suitable game and anime watching partners

one of my colleagues is using a text comparison engine called Vertex (i think it's a google project?) that probably might have some relevance since finding good npubs would mean searching their content, at least in part

i also have got a bee in my bonnet about finally implementing a full text search engine but probably the next big thing after that would be building a text similarity search index... i know it's probably decently performant in the python based system my colleague uses but i prefer to use one language toolchain to do everything if i can. GUIs are a big challenge for me because of this, which is another bee in my bonnet too, to master building web and electron style UI front ends (since this is probably the most universally supported UI system i could learn).