I replicated your experiment. Top link seaching for peertube is peertube.tv/videos/
There are at least videos listed. But they are 80% by the same channel and mostly about cars/EVs with a few other tech things. Immediately i think “this is for a certain type of person” and that aint me.
They really need to mix up their front page to show some sort of diversity. Should not repeat the same creator over and over again. Surely there are 10-15 people on all of pt that could be highlighted.