They sell ads and they work with MS (Bing). But they're EU (French) and I hope more respectful of our privacy because of GDPR.
It's my fallback engine but my main search engine is Kagi, even though it's US and paid-for (no-free tier, beside free trial).
I know saying good things about a paid product is frowned upon around here but I certainly won't lie, or change what I think in order to please some random self-proclaimed vigilante. Imho, Kagi works very well and, as long as you can afford it, is worth every single cent.
It's ad-free, tracking and seo-crap free too. Comes with some nifty features (to further filter and control the type of results you see, for example). I also love their 'small web' search that focuses, well, on small websites by default. That's so cool. Plus, it gives excellent results that must be among the most useful I've ever gotten... like in the 90s and 00s when Google used to be disruptive and useful to its users, not to advertisers ;)
Hi & welcome!
They won't do much to help you find something specifically related to what you're already subscribed to, but those might still help find interesting communities. You may also want to present you new community there ;)