Pick your poison. As Snowden revealed, Cisco was/is regularly backdoored by US intelligence as well.
If they get a zero-day for windows, they can use it all they want... but they should have to disclose it to MS after 30-60 days of knowledge. The NSA is as responsible for technology security in the US as much as spying operations. They need to find a balance to do both.
If they responsibly disclose and that happens before other nation states discover and take advantage of zero-days it makes it much better for everyone.
Who do you think the bigger spy is though, USA v China? Let's be honest.