[bastardoperator]

It's a remote origin, once I clone and branch which I can do from a mirror, I can write and commit as much as I want to the repo, where I push the change up to is ultimately my decision assuming I have access. The point stands, these companies use Github to act as a mirror/backup for their project in the event of something like a disaster (e.g. datacenter fire).

There is no perfect solution and there never will be. Everything has associated cost. You're focused on the distribution of devops tooling, but that is only a fraction of the story. Many large companies have moved to Saas based products because they realize doing it themselves comes with significant cost. An hour or two of downtime is cheaper then a datacenter, equipment, bandwidth, licensing, and expertise to manage all of it.

It's a simple cost benefit analysis. You need to look at this issue through the lens of a business and not just an engineer would be my advise. Interestingly enough you can only point to OSS projects which rarely pay for tooling anyways.