https://techcrunch.com/2021/12/29/tumblr-ios-tags-ban-apple/

Hide your “Tony the Tiger”/”Eugene Levy” fan fiction — those phrases, along with hundreds of others, are now banned from Tumblr’s iOS app.

Now, any personal blog that flags itself as “mature” is not accessible on the iOS app — users will see a pop-up explaining that the content has been hidden because of “potentially suggestive or explicit content.” Tumblr also said that certain posts will be hidden in the search function and on user’s dashboards — which shows recommended posts, as well as content from the users they’re following.