solarpunk memes

Seems like you're trying to address systemic problems of learned human nature at this point, which is something that can't really be done through software alone. There needs to be a fundamental culture shift for that. Yacy is mostly good because it's self-hosted with the option to federate to a decentralized index, and so is able to be tailored to your own needs without any external entity. However, the tailoring process means that the initial search results are absolutely atrocious compared even to Google at first, and then get much better over time. SearXNG, on the other hand, is a sort of self-hosted aggregator of search results from dozens of other search engines, rather than being a search engine in itself. It also serves as a proxy, since it is doing the searching and not you.