Every Peertube instance has its own focus, rules, etc, so the one you browsed may have had educational materials but that is not representative of every instance.
I found beetoons.tv which at least seems to have some gaming stuff. When you browse any Peertube instance if you see a gaming video pay attention to what server it lives on and that might be one worth looking at, it is after the @ in the person’s username.
sponge