Great idea on paper, fails miserably in reality. Searx is supposed to be your selfhostable DDG essentially, by being a meta search engine (using different search engines, not scraping itself).
The idea itself works on paper similar to startpage, many people use an instance and it becomes difficult to understand and profile who searched for what, because all search queries come from that instance itself and not you - since they are proxied.
Many however host it themselves and use it themselves only (or with a couple of friends), making it just another obscure step - it’s you searching from the same IP, it only makes sense when the search queries are masked in a pile of other search queries by thousands of other people.
Now you may think of just using a public instance, that’s how searx is meant to be, right? - sure, but the other downside of searx is that it gets banned a lot on public instances, finding a searx instance that is allowed to return google results is nearly impossible nowadays, bing started blocking it too, so you are left with the same few niche search engines that work.