https://arstechnica.com/gadgets/2018/05/telegram-ceo-apple-has-prevented-app-updates-globally-since-april/

Russia officially banned the secure message app Telegram in April, and now it appears the app is facing problems in other regions. According to a message posted on Telegram by the company's CEO Pavel Durov, Apple has been "preventing" Telegram iOS app updates since April.

The version of the app currently in the App Store is two months old, and Durov claims features such as stickers will not work properly in iOS 11.4 (which was pushed out earlier this week) due to the lack of updates.