https://www.theverge.com/2018/12/13/18139940/tumblr-back-apple-app-store-adult-content-porn-ban

Back in November, Apple banned the official Tumblr app from the App Store over child pornography issues, and today — following an announcement from Tumblr two weeks ago that it would be banning all adult content from the website — the app has been restored and is once again available to download, via TechCrunch.