Misleading packaging has forbidden for ages. Didn't really work out since companies will always try to game the system, binding up resources in endless court battles around the definition of "misleading" and "what font size is legally conspicuous enough yet will still be overlooked by the customer". Therefore the next step was to make very clear and very simple rules around "what is misleading?". One of them is something like "milk is the secretion from the udder of mamalians, nothing else".