

I mean that’s the thing - it does happen, but those people are already being caught
And once they catch one, they catch a bunch of others that were part of the whatsapp/telegram/whatever group.
They don’t need these backdoors to catch them, because the ones caught like this are the stupid ones they will catch regardless.
Your body language can indicate you’re formulating a response, which makes people less impatient.
On a call there’s no body language so if you don’t say anything for a bit people get annoyed.