You're forgetting about corporate accounts. They pay through the nose for something no other tool does right now (at least not as well). Nothing else I've used in the corporate space works as well as Github, especially for code reviews. It's also more expensive than anything else, too. The only problem we saw was it didn't handle large repos very well. And by large, I mean 20+gb. Don't look at me like that, storing every asset in a large 3d game in github made sense at the time!

No, it didn't, we were just lazy.