Not the only issue...
...though the one(s) I have in mind relate to customer relations.
After my wife had to have a pacemaker implanted late last year, I poked around Medronics website and then queried them about what software they're using and how good their device security. After they answer that "top people" had vetted their security, and I basically laughed at them (in the famous words of Dr. I. Jones, "Who?") I got stonewalled. On the software issue what I got was a link to a page with icons for every license that covers something they are using. Noting GPL in ther, I then asked for a link to the source code of the GPL modules they are using. Silence....
Maybe I should try getting back to them, pointing out that their security is obviously crap and that if they won't supply the source code of the GPL modules, they don't have a valid license to use them.
Or, some energetic type could go after them for refusing to supply or make available GPL'd code.