IBM has hit delete on Apple's voice assistant because these "conversations" can be stored and accessed. Plus, everything you say goes to an Apple data center somewhere, apparently. We don't want employees' voice files falling into the wrong hands now, do we?
The news that some major corporations, especially in the technology field, are having second thoughts about Siri as a security risk doesn't seem all that surprising. Siri is loud, and it makes us ask loud, silly questions like "Is that rain?" when everyone can see and hear that it's raining pretty damn hard outside.
Siri might also misinterpret what's being said, especially if you have a strong accent. This is what I think of every time I see the annoying Zooey Deschanel Siri commercial. Hilarious.