most mid range creator already do sponsor works or patreon, fighting for the ad impression money isn't really something you can "do" unless you are in the top 0.1%. (basically, eye balls have limited time, so people flock to certain creator so they more or less feel like in the tribe, it's a social psychology thing, and why pewdepie was a thing. Or why Bieber was a thing. )

I think things like peertube would face the most difficult thing is copyright and content moderation. It would take a lot of effort to maintain good quality contents.