Haha, yeah right. American ISPs got jealous of Australian ones I guess, because most have caps now. With my gigabit connection I have a 1.25TB cap, so I can technically burn the whole month allowance in 2.77 hours. Yay “broadband”!
Ok, in my world that's not a thing. Mobile data is for most people at most a few or few 10s of gigabytes, so they need to pay attention not to watch many HD videos and download big stuff. On wifi it doesn't matter. The biggest reason for people to switch to wifi in a Cafe etc is the data cap.