Software is now sufficiently complicated that it isn't really possible to know the motives of the people creating it. When the people are controlled by governments like China, fear of those motives is reasonable.
Note also that I don't trust the motives of Cisco, either, except to try to maximize their bottom line. (I'm not really worried about rouge employees at Cisco.) I think in service of said bottom line, Cisco and other companies will do almost anything. I'm not say all will do anything, just that some will, and when some will, there is a threat from them, too. Just like Cisco not giving a crap about security when it conflicts with them making more money.
Note also that I don't trust the motives of Cisco, either, except to try to maximize their bottom line. (I'm not really worried about rouge employees at Cisco.) I think in service of said bottom line, Cisco and other companies will do almost anything. I'm not say all will do anything, just that some will, and when some will, there is a threat from them, too. Just like Cisco not giving a crap about security when it conflicts with them making more money.