3TB for the text of 13K user sound crazy, you're right. But for the bill, strictly speaking about bandwidth, a 10mbps unmetered connection gets you roughly that

3TB for the text of 13K user sound crazy, you're right. But for the bill, strictly speaking about bandwidth, a 10mbps unmetered connection gets you roughly that. And 10mbps is pretty uncommon now because it's so low. So I'd expect the bandwidth bill to essentially be free (i.e. included)