But I have written code which is hosted on GitHub which other people have uploaded and I have signed no agreement to let them do so. Does this mean all open source projects older than GitHub need to stop using it?
> If the code had a license that forbid reupload you could ask GitHub to remove it.
Licenses don't need to forbid re-upload generally to be incompatible with GitHub. Given that uploading to GitHub, according to someone quoted on page 1 of this discussion, grants GitHub the right to use that code to "improve their service" (whatever that means -- maybe Copilot?), not explicitly granting that right to them, or the right for someone else to grant it to them, is enough to make them not allow uploading to GitHub.
So that should be more like: "If the code had a license that didn't specifically allow Microsoft to use it to 'improve the GitHub service' you could order GitHub to remove it."
