Maybe, but what if the intention is for the soup to remain a snack credit?
If I had to venture a guess, I would say that a lot of this is stemming from the "serve yourself" drink stations. Lots of people are probably doing the substitution to get the soup, then going ahead and helping themselves to their drink of choice, as well. I mean, come on...the cups are right there and nobody's watching, right? If this is the case, then it's probably being observed at BoG, so mgmt is taking steps to prevent it from happening anymore.