Re: When did it become a thing for illegal behaviour
"to get a fluffy name ?"
Whenever people want to refer to that specific illegal behaviour and have other people know what they mean.
"Surely all the elements of "slamming" add up to conspiracy to defraud, or gain pecuniary advantage by deception."
Indeed. But if I said to you that I'd been a victim of a conspiracy to defraud, or gain pecuniary advantage by deception, you wouldn't know the specific nature of the offence - whereas if I told you I'd been a victim of slamming on my internet connection, you would.
Names are handy.