This message serves no purpose but act as a pushy, in-your face "buy premium" reminder. There's no reason for it to show up every time you place a painting. In fact, there's no reason it needs to show up at all. Nobody is gonna wonder "Gee golly willickers, fellas! Why can't I change this painting by scrolling?!" Instead, it's just spam on your screen whenever you try to use paintings without premium.