I second this, or at the very least, a community YouTube channel, where we could submit our own lessons and tricks.
the naming of the videos would be very important though, something along the lines of “000 - (topic), by (username)”
going back to the marketplace idea though, we could do something akin to how Udemy does their classes, where the teacher uploads lessons, but learners can comment on the lesson and get a response to their question?
Or going the Fiverr route, something along the lines of “for this price, I will help you build a small plugin” or “for this price, I can show you the basics of TiddlyWiki on Node”
We have a lot of gifted users here, so this could be a great way to support them And learn from them!