I’m currently running TubeFree.org, backed by my public charity BT Free (btfree.org).
I do not agree you should put someone on the largest instance with the most reach. There’s a LOT of terrible shit out there. I personally set up a script that reaches out to certain servers I trust, gets their follows, and I follow them. I call it a chain of trust. I think Peertube is working towards implementing this as well.
But honestly, I think the best way, run your own. Or I’d be happy to help you set one up. That way you can have your community, you can pull things in from servers you want to federate with, etc. I honestly think small local communities that interconnect are the way to go. You control the content, you set your own rules, etc.