While Tumblr have every right to have whatever terms of service they like, this feels like a bait-and-switch to me. People and communities have become accustomed to allowing NSFW stuff on Tumblr, and if Tumblr had forbidden this from the get go these people who have set up somewhere else and not on Tumblr.

What we need[1] is for social networks to be interoperable, with open data and protocols, so that a user can up sticks, move to a different site, and take their existing data (posts, images etc) with them and keep their followers.

1. As I have argued before, see https://cabalamat.wordpress.com/2018/08/30/dont-nationalise-...