Meanwhile, some roommates and I hit 1TB in a week in a 4 person household. After quickly switching to an unlimited plan, some data accounting showed almost 80% of that came from the three game consoles playing online (fast connection = you're always the host in Destiny 2 apparently).

What I'm saying is YMMV. I bet you'd see different results if one or two of your housemates turned on 4K on youtube/netflix.