Yes this is what I’m suggesting as to best practice of being aware of what could happen and not so much that it will. Things in the digital world changes to fast to always be aware that one is even on safe ground as to defendable rights.
Case in point.
George Lucas was always fair as to sharing the world of Star Wars with the fans but with the sale of LucasArts Disney has been busy shutting down anything and everything connected to SW as fan art under IP and copyright violations.
Kind of silly hu?
Sooooo
If you make a gun that looks like Mickey Mouse then 100% Disney would sue you if released in a commercial or non-commercial product.
The only fitting advice is if your game goes Angry Birds and makes millions hire a in house lawyer and head of f to the beach for some well earned R&R and let them worry about it. 