Yes but talking about not solving the underlying problem, just putting it all behind a third-party that is known to have issues , which is not just malevolence

Yes but talking about not solving the underlying problem, just putting it all behind a third-party that is known to have issues , which is not just malevolence because it's bound to happen at its size, is the point: you want to solve the issue of how to be efficient, how to make it hostable on consumer-grade machines and connection, you can't involve the magic billion-dollar intermediary. It just moves the problem to another place and it makes you depend on something you can never control. That's not really interesting for hosting your own website.