> Also that there's almost no reason to want to make truly anonymous purchases. Because it implies legality to the activity in question (otherwise why are you paying for it?)

I think most people would welcome a shift to more anonymous transactions, but they're not willing to give up the advantages they get from tracking. When my purchase is tracked by a the seller, I get volume and loyalty discounts and easy returns. When my purchase is tracked by a credit card company, I get the ability to dispute payments and better manage cash flow. Most people and businesses aren't willing to give up those conveniences for anonymity.