Ask HN: What if Microsoft held the country's pcs for ransom?

This is slightly "silly" but I was thinking today about how much of the country runs on Microsoft products, including the government. How much power could they leverage from that? For instance, if Bill Gates made a public announcement "Stop monitoring our shit, or we deactivate all copies of Windows in the country." I know, I know, there are plenty of issues with this, but I wanted to share my thought experiment with you all and see if anyone had any insights/thoughts.