Oh, a data plan would probably make a killer feature. Not sure how you would deal with people doing "things that are rightfully illegal" with it, though.
> Not sure how you would deal with people doing "things that are rightfully illegal" with it, though.
One of the things about privacy-boosting mechanisms is that they explicitly do not make such a judgement. In other words, they refuse to deal with it on principle. The exact letter of the principle differs between the actual people implementing the mechanisms, but the result is generally the same.
I don't personally agree with it, though, so that's my limit on being able to explain it.
The USPS would have records for this sort of thing, of course, but you could also have items shipped to PO Boxes, places that offer greater anonymity, etc.
Furthermore, it's very unlikely that within 30 days of usage you'd be tracked down / monitored and have records queried like that.
It's definitely not a perfect system, but we're working on it :)