We know from Snowden leaks that Microsoft (Skype) & Facebook (WhatsApp) are already freely handing info to any government that asks. Search Wikipedia for: PRISM (surveillance program) Other programs have probably superseded it (and include Japanese ecom giant Rakuten who owns Viber), but you can be sure the user info still flows.

Telegram's independence is what separates them from other services, what allowed them to deny the demand for crypto keys, and why they were targeted.