I work on open source projects* when I have a need that other tools don't quite fill properly, and because I like to work with languages like Rust and C that I don't get to use at my day job. I'd like to have a "buy me a cup of coffee" button on my Github because I have put thousands of hours into my side projects, but have no idea how to monetize really. And I wouldn't want to use the monthly supporter model because often when I finish a project I want to take months off, and may not have another idea for a while.
*like https://github.com/spieglt/flyingcarpet