They are explicitly trying to move away from Google, and are looking for a new option because their current solution is forcing them to turn off ad-blocking. Sounds to me like they are looking for a private option. Plus, given the forum in which we are having the discussion (Lemmy), even if OP is not specifically concerned with privacy, it seems likely other users are.
As for cookies, searxng can’t do any more than your browser (possibly with extensions) can do, and relying on your browser here is a much better solution, because it protects you on all sites, rather than just on your chosen search engine.
“Trash mountain” results is a whole separate issue - you can certainly tune the results to your liking. But literally the second sentence of their GitHub headline is touting no tracking or profiling, so it seems worth bringing attention to the limitations, and that’s all I’m trying to do here.
I noted in another comment that SearXNG can’t do anything about the trackers that your browser can’t do, and solving this at the browser level is a much better solution, because it protects you everywhere, rather than just on the search engine.
Routing over Tor is similar. Yes, you can route the search from your SearXNG instance to Google (or whatever upstream engine) over Tor, and hide your identity from Google. But then you click a link, and your IP connects to the IP of whatever site the results link to, and your ISP sees that. Knowing where you land can tell your ISP a lot about what you searched for. And the site you connected to knows your IP, so they get even more information - they know every action you took on the site, and everything you viewed. If you want to protect all of that, you should just use Tor on your computer, and protect every connection.
This is the same argument for using Signal vs WhatsApp - yes, in WhatsApp the conversation may be E2E encrypted, but the metadata about who you’re chatting with, for how long, etc is all still very valuable to Meta.
To reiterate/clarify what I’ve said elsewhere, I’m not making the case that people shouldn’t use SearXNG at all, only that their privacy claims are overstated, and if your goal is privacy, all the levels of security you would apply to SearXNG should be applied at your device level: Use a browser/extension to block trackers, use Tor to protect all your traffic, etc.