There's a stereotype that the open source people are practical but don't care about political issues and the free software people hate everything proprietary with a passion, but of course that's not always the case. Big companies like Microsoft aren't monocultures. They have some really amazing people, even if not everyone is perfectly enlightened. The path to more user freedom is allowing those good people to continue to push technology in the right direction. This is a step toward more freedom.
Many of us don't just use one computer. I use every OS on different desktops, laptops, tablets, phones, servers, and consoles. They might not all be equally free, but I only need one to be fully free to know that I have freedom that can't be taken away. Even for those who don't have a fully free system, the most important thing in my opinion is that the option always exists. If they aren't served by proprietary software, they have somewhere to go.
GNU won against all odds. It's here to stay, proliferating across so many devices. I'm happy to welcome people who might not have ventured outside Windows into the family!