Not according to professional content creators. Every one I have ever talked to openly states that they regularly alter their content to optimize compliance with youtube algorithms. Content is controlled, promoted, diminished, monetized or eliminated by the algorithms which are the embodiment of youtube's policy decisions. If you want to actually make a living on youtube, you will care as much about what youtube thinks of your content as you do your viewers.
> They host but don’t control content via e.g. editorial policy, ideology or private interests.
They absolutely do control content, by banning content that violates the TOS. And they do make editorial decisions in terms of what content they promote, and what is rewarded by monetization.
And to be clear there isn't anything nefarious about this, nor does it cause these platforms to lose Section 230 protections (despite how often people claim it does).
To push a movie to Disney+ one needs their agreement to take it. YouTube allows anyone to post anything (aside from infringing or illegal).