Fedora is sponsored by Redhat it is true. Not the only sponsers of course. And I get that Redhat is IBM (sadly). I would be a lot more concerned if Redhat was under Oracle, so while IBM isn't great, it could be worse.
But other than that, it is a community driven model, I don't believe they take direction from Redhat or exclusively obfuscate or hamper OSS because of Redhat.
I mean if you go down this rabbit hole, take a look at all the major contributors and sponsors for the linux kernel itself....