Did anyone expect otherwise? Telegram is a mostly unencrypted chat application, of course it's going to cooperate if local law enforcement comes knocking on their door with a warrant. If you don't want your chats to end up in the hands of law enforcement then you should consider using an end-to-end-encrypted messenger application.
Signal will hand over your data too if the police show up, but they don't have any data to hand over.
Signal will hand over your data too if the police show up, but they don't have any data to hand over.