I agree with you, but I do think we have a bit of a problem in which an open source creator makes something and then suddenly finds themselves accidentally having created a load-bearing component that is not only used by a lot of people and companies, but where people are demanding that bugs be fixed, etc., and we lack great models for helping transition it from "I do this for fun, might fix the bug if I ever feel like it" to " I respect that this has become a critical dependency and we will find a way to make it someone's job to make it more like a product".

I gather that the open source maintainers who have found themselves in this situation sometimes get very unhappy about it, and I can see why -- it's not like they woke up one day and suddenly had a critical component on their hands, it kind of evolved over time and after a while they're like "uhoh, I don't think this is what I signed up for"

Public funding from governments would make sense. Open source software are effectively public good.

I think expecting to get paid to fix bugs, add features, etc. to one’s open source code is much more reasonable and there should be marketplace infrastructure that makes this much easier to do (compared to the current system where developers have to apply for corporate grants for long running projects).