Google is way to compliant to DMCA request resulting in bad result. Bing doesnt seems to care and will happily link to live and replay of sport event (the main reason I use it personnaly) even as a first result.
PS : If you’re french dont forget to change your DNS or any quality site will not load
I believe the idea is that searx strips out tracking/data from the queries sent and recieved from engines.
There’s some info here
As for the browser tracking you, yes. It doesn’t matter what search engine you use on a browser like Chrome it can still track you.