It's a crazy idea: Give your software (content) away for free and hope that people like it enough to send you money. That was the idea behind shareware, a popular commercial software model in the 1980s and 1990s.
NOSTR supports this!
https://www.howtogeek.com/728527/what-is-shareware-and-why-was-it-so-popular-in-the-1990s/