It's not about organizations _demanding_ that you do work for them for free, it's the constant _expectation_ of it. I experience it myself quite often where users of my software ask about timelines for bug fixes or new features, but very rarely offer to chip in and certainly never to sponsor the work.
Of course these organizations have no way to force me to do anything, but it is emotionally draining to constantly have people expect you to.
I wonder where this expectation comes from? Is it because of high quality free as adware/spyware commercial software? Or the way development centered around repository name and we do not use forks?
I treat open source as a gift. It allows modifications, it allows forks, what's wrong with people?
I would be happy if somebody asked for timelines for feature requests, because it would mean that I have the option to extract money by prioritizing those features. Just make the companies bid against eachother, writing a bidding system (maybe second price auction for a work point where you set the number of work points needed for a feature) is really easy.
I already offer both sponsorship as well as tailored consulting, but I haven't found any success in trying to sell that in response to issues. The moment I mention that I can provide commercial support, they tend to become silent. Maybe it's viable if you have a truly massively successful product like Redis or something, but it hasn't been for me at least.
I'm really sorry about that. Still, probably every successful open source project should offer the commercial support by default, I feel like that's the best way to change the culture.
Of course these organizations have no way to force me to do anything, but it is emotionally draining to constantly have people expect you to.