Happy ex-Comcast customer as well (as much as it pains me to say it, ATT has actually been pretty good to me with their fiber) but your numbers seem to go against a 1 TB limit but even the gigabit pro plan already includes the "unlimited data" option which allows you to go well past that. They never would say what exactly "fair use" was but it was at least above 15 TB/m from what I could tell of not getting kicked off.
Oh interesting. When I was in California, my 1 Gbps plan came with only 1 TB of bandwidth. They did sell "unlimited" as an additional upgrade but IIRC it was $50/month.