Is that for real? I was under the impression that Jonald was intelligent. "I don't care if Stalin is shady I like his uniform" ... holy crap 
it would only be a worry if bitmain had a exploit against bitfury or bitfury had an exploit against bitmain..
but finding that bitmain "could" only access their own products and "if" they triggered anything they would end up with queues of refunds.. its not as big a deal as say a soft fork that bypasses real network consensus, to add code that if activated changes the network into a tier network without nodes consent/veto ability
I see. So you would buy a Chinese car, which can be disabled by the Chinese car manufacturer which in turn has close ties to Chinese government (and all Chinese companies have close ties, to say it very nicely)
And you would say "As long as Ford does not have the exploit against my car I am not worried", well maybe you should cut down on your happy pills LOL
With all those happy pills, you can, of course, not see the dangerous situation that would have arisen if a large portion of the worlds hash power could have been disabled instantly (various attacks possible, 51% and below)
BTW refunds??!! From China??!!