said by Kardinal

This would imply the network can see at who the primary account belongs to and would throttle the line no matter what login was used (be it Sympatico or another provider) -- basically, it throttles according to which physical line is being used, not what login is being used. I just can't see that as making sense as traffic shaping would be layer 5 or 6, not layer 1.
That is what DPI boxes do... They can throttle using the upper protocol layers and I think that the ones they use for BS can also see the TSI and other traffic. Anyway I guess we find out soon.