Users noticed that Telegram was no longer available on the App Store in several countries including the United States, but it returned shortly after its disappearance without explanation.

Telegram was removed then returned to the App Store
Telegram is known widely as a secure alternative to Messenger, WhatsApp, and iMessage. Its cross-platform availability and options for end-to-end encryption have made it attractive to privacy and security-conscious users.
Reports began showing up across social media of Telegram disappearing from the Apple App Store around 9:30 p.m. EST on Monday night. Users searching the App Store or opening a direct link to the app showed that it was no longer available.