Honestly, this really resonated with me. Running an open source project on its own can be hard, running a popular one that gets used by tons of people and companies, while giving free labor, is extremely hard. Acting as free tech support to a large company, for nothing in return, is ass. Full stop.
I've seen some people make the statement that "maintainers owe you nothing", and I've seen people state that "your supporters owe you nothing."
While I believe there's nothing wrong in a person willingly running a project on their own terms, just as there's nothing wrong with refusing donations and doing the work out of some kind of passion... there's only so many hours in the day, and developers need to feed themselves and pay rent.
I think a lot of people would love to be able to work on open source full-time. I'd devote all of my energy and focus to it, if I could. But, that's a reality only for a privileged few, and many of them still have to make compromises. The CEO and founder of Mastodon, for example, makes a pittance compared to what a corporate junior developer makes.
While I think shareholders can be a driving factor, I see it way more often with VC-funded companies. The "2.5x year over year" growth mantra that places like YCombinator stipulate have disastrous effects on small tech companies. Often, these startups have an incentive to keep taking additional funding rounds, which appears to tighten the grip the VC has over them.
Try growing the next Microsoft or Google or Amazon out of that model. I'm not convinced that it's possible. At least if you bootstrap your own company, you don't have the same binding obligations...even if it takes way longer to get to a place that's self-sustaining.