One more comment - while they say they will block (for example) “ISIS-related” bots and channels they would have no way to know what the content of a Secret Chat is, because it uses end-to-end encryption. Not that it’s unique to Telegram, but there’s an example where terrorists would benefit from this service. They say they will only give up data “if the issue is grave and universal enough to pass the scrutiny of several legal systems around the world”...which makes it pretty fussy. Clearly they wouldn’t do so at the request of say, the US government.
I saw that too... They say they can’t share what they don’t know or even access themselves. I kind of like that. :)