[rtempaccount1]

yeah there's a variety of "free at point of use" services driving the Internet and, sooner or later it seems likely there will need to be a change in how they're funded.

It's not just Docker hub, there's services like the various Programming language package repos (npm, rubygems etc) and the Linux distro package repos.

I would have had Github in that category, but now it's owned by MS, presumably they don't have many of that kind of funding problems...

[toomuchtodo]

Github used to be in their own colo on their own bare metal. I'm not sure if they've been pushed into Azure cloud as part of the MS acquisition, but either way Github isn't paying cloud retail ($$$) for their bandwidth, and it's likely sustainable.

[judge2020]

Yep. Even before the acquisition in 2016, GitHub was doing fairly well: https://news.ycombinator.com/item?id=13218842