How does open source avoid that? Red Hat, which got bought by IBM; both of them have executives in spades, as does Google and Meta, both of them are huge supporters of open source. (Not including Llama. Fsck Mark Zuckerberg for co-opting the term Open Source for llama when it isn't)
Of course, the PMC, being the parasites they are, will try to siffon value from everything they can. My point is merely that it's more difficult for them with Open source because quite often no money is changing hands. I don't pay for my operating system, I use Fedora. If I were to pay for it the rent seeking PMC will take their cut of what I paid, and most likely the largest cut.
OSS contributors choose to give their work away, including allowing it to be sold. The "PMC" (sigh at othering term) can only make money by creating value. Their customers choose them over free because of that value.
You are more like the "PMC" in your statement than they are, because you just use other people's work. At least they add value.
In fairness to your point - Ubuntu is a very, very strange company with wildly absurd hiring practices. Ubuntu + RedHat sells your position well.
Of course we should acknowledge that there are many viable Linux distributions out there which aren't part of bloated dysfunctional organizations. But I do fear for Linux itself after Torvalds.
Sorry, Bill Gates is not PMC - if we're going with a neo-Marxist analysit of class, Gates is firmly Bourgeoisie, while all of us operating the business machines of the day and using our intellect to help organize and manage the resources of society are the PMC.