Running an actively used Peertube instance is a lot more expensive than, for example, a Lemmy instance. Videos take up a lot more storage than text. Not only that, the videos also need to be processed and then served. Who will keep paying for the monthly server bills?
Then there's monetization. Most YouTube creators are there because they make a living out of YouTube. There is no such thing on PeerTube. They would need to solely rely on donations.
The ideal PeerTube network would be where every somewhat big content creator ran their own instance and maybe a few general instances for smaller content creators that are regularly donated to.
If YouTube ever gets killed by Google, don't expect many people to come here.
Why is the terminal useless?