Is it? There are several GitHub alternatives, many completely free as well, and none of the source was lost unless all the maintainers and contributors also delete their local copies.
Re:GitHub is now free for teams
by frosted-flakes on Wednesday April 15, 2020 @08:50AM
(#22877083)
The alternatives don't have the mindshare that GitHub has when it comes to open source software. If the community around the game is already weak, moving to another provider will likely weaken it even more. The source won't be gone, but that's only half of what matters.
I worry about the community dying and losing my favorite game, but have taken solace in the fact that the source will always be publicly available. If it was banned from GitHub, that's a major problem.