I love YaCy and I'd love to see it here.
I completely understand the political/ideological desire to de-middleman internet searching. It's a worthy cause but in 2022 I don't think it's the solution to private daily driver searching.
Where it excels for me is as a really neat private productivity tool for those of us who do have a pool of sites we're constantly referring to. My YaCy indexes save me tens of hours a week and let me surface things I never would manually. I don't know how you replicate this without getting into Apache Nutch which has technical skill requirements an order of magnitude higher. It's a shame it's a bit long in the tooth.