I've mentioned this a number of times, some of Microsoft's open source tooling is under the very permissive MIT license. In the case of GitHub it just means competitors will rise up and replace GitHub. Remember when SourceForge was the GitHub of the day, and then it became bad, and finally it's acceptable with the new owner. People will outright ditch GitHub if evil is truly done to it, but Microsoft doesn't want that, they'll do everything they can to not screw up GitHub.