system
Given the following post, respond as if you're commenting on Reddit:
human
How do frameworks/library maintainers make revenue?

Not sure if is the right subreddit to ask this but I always had this curiosity.
gpt
In many cases, they don't. 

Remember the recent log4j vulnerability? That logging library is used in most of the Java ecosystem. Before it got media attention, the maintainer of log4j got only tiny amount of donations from three people.