You're not wrong, but commercial entities also go bankrupt, stop funding projects or take care of code quality just enough to be able to sell a product and get

You're not wrong, but commercial entities also go bankrupt, stop funding projects or take care of code quality just enough to be able to sell a product and get the money. Clearly unpaid volunteers seem to be a successful alternative to the commercial world when it comes to general code quality and especially longevity. It's also often the case that those unpaid volunteers have a day job related to the projects they volunteer in, so there is some direct or indirect financial support. It seems reasonable to assume a large part of open-source software and infrastructure is maintained by people having vested interests in it.