Telegram's information is encrypted and only those who are in the chat may see it. There's also an option to erase all messages when a set amount of time has passed.
This makes it more difficult for law enforcement to track down criminal behavior and the perpetrators. Furthermore, there are strong privacy rules to follow, which means the cops can't just lure someone into doing something criminal. As telegram end to end encrypted so, in my opinion, it is safe.
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How open is Telegram?
