Instead of recommending “peertube” itself we should point to servers that have open registration

I'm generally an advocate for doing this for the entire Fediverse. "Mastodon", "PixelFed", "Lemmy", "PieFed", etc., are not places people can go to experience the Fediverse. They're pieces of server software that let you stand up websites, just like WordPress is. You'd never tell people to check out "WordPress" when you want them to see some restaurant's menu or to look up your business or whatever. We shouldn't be doing the equivalent with the Fediverse.