You can't build a decentralized search because there's no way to trust whatever results you get until you actually build it. If you don't want to rely on a specific community, your best bet is to crawl yourself and search locally: you can do that with magnetico (https://github.com/boramalper/magnetico/). Don't be frightened by the fact that it is archived, it works.
The problem then will be, how do you make sure your content is legit? There's no magic way here, the best thing you can do is compare the number of seeders and aim for the highest. If a torrent is fake, people will delete it and it won't be seeded. I have a thingy for that: https://sr.ht/~rakoo/magneticos/
The problem then becomes, number of seeders naturally selects towards popular content. It doesn't ensure viability of content. But I don't think there's a technical answer to that.
Very interesting, thanks for sharing your project. Magnetico is also integrated into Jackett I believe, which might be helpful to some people who use that
The problem then will be, how do you make sure your content is legit? There's no magic way here, the best thing you can do is compare the number of seeders and aim for the highest. If a torrent is fake, people will delete it and it won't be seeded. I have a thingy for that: https://sr.ht/~rakoo/magneticos/
The problem then becomes, number of seeders naturally selects towards popular content. It doesn't ensure viability of content. But I don't think there's a technical answer to that.