> And none of these things were ever made illegal.
Those things are barriers that make it more difficult to be criminal. We're talking about a factor that removes those barriers and makes it easier.
What are you talking about? Thieves' cant, burner phone, clandestine meetings--these are all things that make crime easier, and none of them are illegal. We ban crime, not things that allow crime.
Not sure it's ever been particularly difficult to be a criminal. If anything, the tricky part has always been establishing who you can and can't trust.