The risk is that Apple code sign's all the executables they ship and that someone could try to use GPLv3 to force Apple to either give them their signing keys to run their own version (the anti-tivo clauses) or that it would restrict Apple from suing someone for patent infringement because they've shipped GPLv3 software.

Valid or not in anyone else's opinion, it doesn't really matter, the risk that someone will attempt to use a court to enforce one of these tends to mean companies don't want to even go near it.

Working in a Bank we won't touch anything GPL3, even to build our software/services or mobile app, because we don't want to even open that Pandora's box.

We don't have to find out if a court would try to force us to release our signing keys if we don't use or ship any code that contains language that could in some ways be phrased to do that.