Telegram is for the most part not end-to-end encrypted, one to one chats can be but aren't by default, and groups/channels are never E2EE. That means Telegram is privy to a large amount of the criminal activity happening on their platform but allegedly chooses to turn a blind eye to it, unlike Signal or WhatsApp, who can't see what their users are doing by design.
Not to say that deliberately making yourself blind to what's happening on your platform will always be a bulletproof way to avoid liability, but it's a much more defensible position than being able to see the illegal activity on your platform and not doing anything about it. Especially in the case of seriously serious crimes like CSAM, terrorism, etc.
Not to say that deliberately making yourself blind to what's happening on your platform will always be a bulletproof way to avoid liability, but it's a much more defensible position than being able to see the illegal activity on your platform and not doing anything about it. Especially in the case of seriously serious crimes like CSAM, terrorism, etc.