What would it take for you to move away from Github?
Let's be honest, the majority here probably has a github account. Some of us are happy as a clam and wouldn't switch no matter what happened, but there are some who would and haven't yet. Why?
Seriously though, it would take something rather drastic. Our company briefly tried using bitbucket, but it was just worse overall. Don't touch a running system.
I haven't had reliability issues with BitBucket. My main complaint is it's just really difficult to use.
I just find my time in GitHub is smoother and easier. For example comparing branches/tags to each other... in GitHub if you open a release from a week ago, there will be a link "this is 12 commits behind your main branch" and you can just click it to view the code in those commits.
BitBucket doesn't even have releases. They just have tags which can trigger pipelines. Functionality wise, it's the same thing. But from an ease of use perspective GitHub is so much faster and easier to navigate as long as your project follows standard branching/tagging/etc practices (which it should, especially if you're working on a team).
They recently added it as a experimental feature and it has been working fairly well, at least for Java. As far as I recall, each user needs to activate it themselves via settings. Far from optimal but better than nothing.