Earlier quoted context omitted.
And that's why for countries who aren't US closest allies it makes total sense to base military infrastructure on open-source operating systems and software (because let's be honest, Russian or Chinese military most likely won't be able to produce their own modern OS of comparable quality from scratch). However, software and hardware on one hard, and internet on another, aren't the same thing: I don't see how one can…
Why only military infrastructure? Image a war between, say the USA and Russia, and imagine that the USA manages to shut down or cripple all Windows machines in Russia, this will probably put the enemy on the kneels, even more than weeks of airstrikes. And it may also be better PR as it do not directly "kill" anyone. I have always thought that Microsoft holding 95% of PCs in the world is extremely dangerous, and can't…
Hell, we don't even have to imagine — remember testing JS on every browser around 2007?