> And I am one of the people saddened by the convergence on a single platform.

Hardly surprising, though, social networks are prone to centralization (due to network effect), and GitHub & its competitors (anything that offers git repos + issue tracking + fork-ability, really) are social networks.

Also, GitHub offering private repos for free right after they got acquired by Microsoft helped a lot. A lot of people, myself included, were using gitlab.com for private repos at that time