[Lazare]

Migrating from github: Sure, lots of reasons why you might want to do that. Just being sure you can has value.

Migrating to Bitbucket: Uh....

I don't really see any way in which Bitbucket is better than Github. Or, frankly, any other alternative. It exists due to inertia and/or to serve people irrevocably emeshed in the Atlassian ecosystem. I can understand why you might not have switched away yet, but switching to it?