It's not entirely clear if the total ban was what compelled Apple to add it back, but it's worth noting the app's listing says "This particular update also includes changes to Tumblr's Community Guidelines, which prohibit certain kinds of content from being shown on Tumblr." The website, which shares a parent company with Engadget, uses an algorithm to scour for and flag inappropriate content. It doesn't seem to be working all that well yet, leading to flagged images of food, dogs and other perfectly innocent content.

It'll be interesting to see how the blanket ban will affect the platform, seeing as it served as home to a lot of risque fan art and fan fiction, as well as nude photos, for a very long time. That said, some content will still be allowed under the new rules, including breasts within the context of breastfeeding, birth and other health-related situations, newsworthy events that just happen to have nudity and nudity in art.