So, because that is what they all say, it is really probable no a person seriously understands why Tumblr is performing this FOSTA has been blamed, and so has Apple's app retail store gatekeeping practices. Rightly so, since Apple's part in censoring and suppressing sexual speech is longstanding, and so vile and insidious that it'll make you rage-smash an Iphone if you get it all in at after.