> We didn't forget that our community was called a cancer

This is disingenuous. He was referring to the licensing model of certain open-source projects, where the introduction of a single line of code coming from an open source project would require the whole of the Windows stack to be open-source, effectively "contaminating" the rest of the stack. To this day this is still a problem to many companies and legal department must carefully review the licensing of the libraries used by their devs.