Not to harp on the bicylcles, but when you start implicitly banning stuff on shabbos, it is a slipperly slope. You can ban something that is permitted and someone finds out that you are calling a chumra a Halacha, they wont belive you on anything you might say.
I have heard many things called “Ovda D’chol” that are really pushing the boundaries. According to some reading Shakespeare is Uvda D’chol or talking about the Baseball game .