Users don't spend anything. The $20 example I used is the cost of the most basic virtual server on which a webmaster could run their own instance of PeerTube.
This is like the Mastodon of Tubes, Mastodon is a decentralised Twitter alternative that is gaining a huge amount of traction because of it's federation model.
These technologies, Mastodon & PeerTube all use the W3C ActivityPub protocol, which allows for widely distributed yet consolidated services which can all communicate with eachother.
There is a Mastodon instance of PeerTube
https://peertube.mastodon.host - users right across the Mastodon social network can share, comment and engage with PeerTube video content without leaving Mastodon.
Mastodon also has apps for iOS, Android and other platforms, which means it's becoming widely accepted and the user growth has been phenomenal.
PeerTube only came out of beta a couple of months ago, Mastodon has been around longer.