No, the scam is that the phone company makes you keep land line phone service to have DSL... The same phone wires stay connected whether or not you have a land line phone, they never come out to the house to hook you up, but they will not allow DSL unless you have a landline phone.

There is nothing technical that I am aware of that requires voice service to enable DSL...

It is just a way to demand more money for the line, whether you ever hook a voice phone to the line or not...

It would be perfectly reasonable to get DSL only across the line. I assume it is only because the voice company controls the line.