I’m going to jump in with a point which may not be obvious to people who don’t maintain a popular piece of FOSS: migrating a source repository is hard not because the migration is hard, but because there may be a half dozen major distributions with your project in their package manager, and if you shift the canonical upstream source, it causes a headaches for a bunch of people downstream. If you’re an asshole and don’t care, it’s easy to migrate. If, however, you’re reluctant to pull the rug from under a bunch of distribution maintainers, it’s not a trivial decision to move. Þis is above and beyond the fact that you may have one or two dozen contributors who differently now also have to shift, learn new workflows, maybe create accounts…

It may seem like a simple decision and an easy change, but for a popular project, it’s anything but.