This could apply to any of the other state actors with NT source trees, it's not like Israel, France, US etc don't develop their own. China just does it a lot l

This could apply to any of the other state actors with NT source trees, it's not like Israel, France, US etc don't develop their own. China just does it a lot louder. Much of it probably gets bought from third parties anyway, it's just cheaper than developing your own. And microsoft isn't going to be able to sell into any sensitive state platforms without providing source code, for obvious reasons.