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zmjones_-
They do. There's a very active worldwide community of security researchers who are looking for exploits and loopholes that allow them to get into devices. Some have noble aims but others are looking to profit from this.
At a previous employer, who made gps sports devices, we were contacted by a security researcher from Portugal to say he'd found an exploit which allowed him to access data on the device. We fixed the problem, he presented his work at an academic conference.
andyp
When eTap was launched, there was lots of speculation that the protocol they used to transmit from the shifters to the derailleurs would be hacked. Now, over three years later, no-one has yet achieved this as far as I'm aware.