What's perverse? That they use Github for proprietary software? That they give source-code access to users of their software?

FYI these restrictions are due to Epic, not Microsoft.

This would be against the license.

It is hard because this is the way for the EULA and Licanse of the software to be enforceable.

I don't agree with mirroring the repo elsewhere but agree that the process could be much more streamlined.