I mean if making critical decisions about who you want to trust, where you want to store your code and data, and how you want to operate your day to day business, based on an evolving market is being a "brat" then yeah.
I'm not expecting GitHub to change much, if at all, but part of an open internet is people and companies being able to choose how they want to do things.
The reasoning isn't "it is owned by Microsoft"; that is just a trigger. The reasoning is thoroughly mentioned:
"[..] But independent of that, GitHub has always had a vendor lock-in with the user's issues and pull requests hidden behind a rate limited API instead of a proper export feature. And even if you managed to export it through that API, you can not host your own GitHub instance and modify it as you like because there is not even a partially open source version of it."
I'd love to see Microsoft turn the tables and open source (at least partially) GitHub. I don't think it'll happen but it'd certainly get some interesting responses.
