Is it though? Like who was promised anything for doing open source software development. It's like volunteering at the soup kitchen. Yeah you're not going to get paid and people are going to eat and leave. That's kind of the point.
Personally, I open-source my random crap because it's possible that someone else had a similar problem and would appreciate a pre-made solution. I have been on the receiving end of that many times, and paying it forward is the least I can do.
People are getting harassed a lot for not supporting their software as others think they should. Look at the xz guy, he basically quit because he couldn't take it anymore.