Fennec on f-droid has anti-features, it connects to mozilla services that can track users. Does it HAVE to do that? Should I use it if my trust in firefox is eroding?

With recent concerns about Firefox and the mozilla corporation I am starting to wonder if I should take stock of alternatives. A common recommendation seems to be Fennec, but given what F-droid describes as anti-features, I wonder if I'm essentially replacing the problem like for like.

What do they mean? What services? Optional ones? Can it be used without connecting to any mozilla services at all?