Data Usage Discrepancy

Has it been explained to anyone how Cox actually monitors data usage?  My guess is they're monitoring the MAC address of each cable modem that is registered with their network and then all upload/download traffic is calculated, rounding to the nearest GB.

Rant....Higher speeds warrant higher data usage tiers but Cox continues to keep all connection tiers at 1 TB; resulting in customers having to pay an extra $49.99/month for unlimited data on top of their connection speed tier service.  Although connection speed and data usage are mutually exclusive it defeats the purpose in only giving 300Mbps and 1000Mbps tiers 1 TB of usage.  I would argue the 100Mbps tier should also have a higher usage tier than 1 TB as well.  One TB is nothing anymore and people, including myself are backing up to cloud based solutions to protect home video's, photos etc, in addition to streaming TV with multiple devices in the household.  Throw in home surveillance and that chews up the "data usage" even more.  Cox has an answer for the home surveillance though...get their HomeLife and it won't count towards your data usage.  They provide a separate router to keep home security and home internet traffic segregated, forcing you to use their service instead of who you want.  Going to stop as my blood pressure is spiking.