@anoux I can really recommend @kuketzblog: e.g. https://www.kuketz-blog.de/browser-welche-ich-aktuell-auf-dem-desktop-nutze/
You probably have to use a translator, but it's worth it. He looks at the privacy of apps/services/.. in a very detailed way. Btw: I don't know him personally nor am I connected to him in any way - I just really like his work