Or maybe they don't want spied on
Could it not be possible that before buying any big piece of network kit many people are looking elsewhere than the usual suspects (that get reported on for these results) so they can get a router/switch that has not been modified by the NSA?
I know if I was buying a big fuvk off switch I would be seeing who else could provide it. Personally I would go for the chinese, as they are less likely to swoop in with guns and lift the people I sold the switch to.
On a smaller scale, I certainly refuse to buy anything that has "made in Murica (fuck yea!)" on it.