So Microsoft is highlighting the value of software freedom and the harm of software non-freedom: we're all granted permission to port free software (as Microsoft claims to have done with the Linux kernel, BusyBox, and more) but only Microsoft -- the proprietor -- is allowed to port Windows.

So long as we value software freedom we can take steps to defend software freedom and continue to see practical gains. But proprietary software leads us to a dead-end waiting for a willing proprietor to do something for us (and thus providing a result we cannot trust).