I was just about to test if there was a builtin penalty for connecting to streaming TV services (use any of those?)
I found that I was hit with 100MB per day for only breifly connecting to these services, and that was well above what my router counted for bytes.
But; on the other side, Cox counts bytes that hit your modem, they may not actually go anywhere....
This is the byte counts of various channels on my modem. ENP is public IPv4 address. HE is IPv6 Tunnel (public), and BR0 is to the internal network. Notice that the total of public is 26Meg, which is what the usage for that day is, but I acutally only used 18GB in reality. Cox has no way to know if some anonymous TOR user is blasting your network with packets that aren't being used or if you are using them.
byt ENP: 18,546,679,517 BR0: 18,153,998,369 HE: 8,058,984,076
Not to mention that at top tiers 1TB is less than 1% of the network you can actually use in a month.
But I'm off to connect to syfy for a few minutes and see what my usage is tomorrow.