Blender uses Peertube as a major platform for videos about Blender and made in Blender. Blender is a perfect example of actually committing to using Peertube and showing it can in general work.
As far as instances I recommend, Spectra.Video looks good I have been thinking of making an account there
gnu linux seems like a decent Peertube instance too!
Here is a good gaming focused Peertube instance
I think people way overthink the difficult of bringing new people into Peertube and the Fediverse. What is sticky are the people, artists and organizations that have people who trust them and seek out what they make, not the platforms. What is sticky about the Fediverse is that people are compelling and interesting to interact with here.
If creators decide to come here themselves, their audience in the end isn't going to care that much where they go to get the videos especially if it doesn't require an account sign up to access.
It will take time, but the inspiring thing is it is already completely possible to do!