There's no way for them to reliably differentiate the traffic. If you're intentionally being dishonest to avoid their ability to track you. There certainly are ways for them to differentiate the traffic of devices that aren't attempting to avoid their detection. Whether or not they detect it is beside the point. The point is: by doing it, you're violating the TOS. You're breaching a contract YOU signed. Those of us who are honest people consider that to be important, in and of itself.