How do they know that all the contributors to your project consent to this usage? How do they know that the project you're hosting is actually your own and tha

How do they know that all the contributors to your project consent to this usage? How do they know that the project you're hosting is actually your own and that it's only using code written by people who permit this. This seems like a legal disaster. Leave it to Microsoft to do something like this. No wonder they "love" open source.