That's my point. Security people were analyzing network traffic for decades trying to spot something that doesn't fit, host-wise, pattern-wise or even packet-wise (see The Museum of Broken Packets[0], for example). And someone managed to somehow hide all this traffic from security experts working for Amazon and Apple, for months or years? I'm very curious to see how.

[0] http://lcamtuf.coredump.cx/mobp/