The success of the do-not-call registry (and the fact it is raised in this discussion at all) shows precisely how little people care about privacy.

The do-not-call registry stops people being bothered by unsolicited calls. It does nothing at all to protect privacy.

People care about the annoying calls, go on the do-not-call registry and they stop so as far as they are concerned the problem is fixed. But the companies keep collecting the data. There is zero change in privacy,