Despite the claims that #Telegram never shares any data or metadata, there are relatively clear cases of them having shared metadata with an Indian court and German law enforcement.
There are strong indications, as reported by Wired, they might have shared message contents with the Russian government, targeting activists in Russia.
By default, Telegram chats do not use end-to-end encrypted mode aka "Secret Chats". End-to-end encryption is also completely unavailable for groups and channels.
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@rysiek they are routinely reported as secure/encrypted when they are in the news - I saw several stories repeating this with the news of the arrest in France.