Why is Telegram blocked or restricted in several nations?

India temporarily banned Telegram over fears of fake NEET-UG 2026 re-exam paper leaks. China blocked the app under its internet censorship regime. Iran imposed a ban to suppress 2018 anti-government protests. Russia, Ukraine, Spain, Thailand, Azerbaijan, Cuba, Brazil and Pakistan have all restricted or suspended Telegram at various times over security, political, legal or content-related concerns.