Is it really though? The tools might be proprietary, but the workflow should be easy to move. E.g. You need to have a code review before a commit is merged. It

Is it really though? The tools might be proprietary, but the workflow should be easy to move. E.g. You need to have a code review before a commit is merged. It happens that Github has a good set of tools for this, but if you decided that on date X you wanted to move away I don't think it would be that hard to shift away. You'd have the same mandate about code review, you just point people at a different tool set to do it.