>>220554So did anal sex, and interracial, and pornography in general. The answer is that porn got normalized in society, in more niche spaces such as anonymous imageboards it's expected that more extreme form of certain fetishes (such as the clitty cages) would become normalized first. Nowadays you will see normalfags on social medias making bibisi jokes.
I think it's retarded to think about this kind of thing, I don't why, it sounds very stupid to wonder about this kind of thing, also you're looking at a /gif/ screenshot, a place that there is nothing but tranny and nigger worship threads.