But the demand is high. There are lots of users, many in a corporate sense using my software to further progress their organization.

tbh there will always be demand for free work, these small libraries that people don't support seem like free code to me that corporations can write themselves relatively easily.

There is a lot of challenges to this. And these are only the things I thought of. I’m sure in reality it’s even more complicated. That’s why I don’t think the moral reponsibility at the moment falls on these companies. There needs to be a system in place that handles the contributions from users and distributes them to projects and dependency projects.

There are plenty of options and case studies for how to do this, in particular tidelift (which was started by a legit open source contributor) is one option, people manage to raise money using open collective and offer incentive through patreon (vue.js is a good example).