> GitHub definitely dominates the market, partly due to the network effects, but I don't think they have a lot of moat. If something goes badly enough wrong there, there will be plenty of viable alternatives with an easy to trivial migration path.
Their moat is a billion development tool vendors that have "integrate with Github" as a must-have and expected functionality.
> BTW there's launchpad.net which is often overlooked, bit it's vital for Ubuntu-specific projects.
It's overlooked because in true Canonical fashion they went hard in on their not-invented-here-syndrome VCS that nobody asked for or wanted. That and also the integration with Ubuntu and nothing else.
A bunch of larger projects have a mirror on GitHub for easier access.
BTW there's launchpad.net which is often overlooked, bit it's vital for Ubuntu-specific projects.
At paid day jobs, I had to use BitBucket at least twice, and I miss better code review tools, like Phabricator.
GitHub definitely dominates the market, partly due to the network effects, but I don't think they have a lot of moat. If something goes badly enough wrong there, there will be plenty of viable alternatives with an easy to trivial migration path.