Comment by cinericius

They want to have control over where their code lives, and not have their code subject to the terms of the service of the platform they use.

For example, I might want to host my code privately on GitHub and not have Microsoft use it to train their LLMs. That doesn't seem to be possible:

https://github.com/orgs/community/discussions/135400

https://github.com/orgs/community/discussions/171080