Lots of rumour
I see lots of rumours and FUD, but no evidence.
This is in the same order as saying Cisco ships all of his gear with spyware, so that the
US can spy on everyone else.
If there really would be evidence, lawyers would line up to go to trial and ban the products from the market.
So I guess a big part of this is about protectionism.
A country cannot be officially protectionistic by closing the borders for certain products, so all kinds of FUD is spread to keep the competitors from the home market.