Unshaped signal is just noise. I think every society controls information in some way; "How much and how is it controlled" is the real question.
YouTube isn't obligated to share the Oath Keeper content; they're perfectly free to host it themselves. We are also perfectly free to decide YouTube's info-shaping is not to our liking and watch something else. It's freedom all around, including the freedom to not propagate a signal.
I would frown to see "out of control" though.
If one can't find anyone to store and forward one's content, then yes... One's content will be hard to find online. It's a big world, and that practically isn't happening much. YouTube has competitors that host content YouTube drops, be it for copyright violations or for "significant evidence presented in a court of law against a creator for a very egregious crime."
> Let's say that it isn't right-wing content they are blocking, but left-wing
Anecdotally, I've gotten suspended from Facebook way more often for espousing Communist thought and asking if Americans are fit for running a Democracy. Which is fine ... Their service, their rules. They're not obligated to host me and I'm not obligated to use them.