https://techcrunch.com/2018/11/19/tumblr-booted-from-app-store-due-to-child-porn/

Tumblr’s app was booted out of the iOS App Store a few days ago due to an issue with child pornography getting its way past the app’s filtering technology, according to a report from CNET, which Tumblr then confirmed.

The app’s disappearance was first spotted on November 16,  and Tumblr’s help documentation had also confirmed the company was “working to resolve an issue with its iOS app.” The statement said Tumblr hoped to have it fully functional again soon.