the average usage of american households is not 200-400 gb per MONTH ..its 200-400gb per YEAR.
I am an excessive internet user my pc constantly sucks data at high capacity ...youtube permanently running on 1080@60 or higher,massive downloads every month of new games or games i wanna install again from various platforms, im on 24/7 and pretty much no lifing the internet on a 100mbit connection.
My email client alone has consumed 664 mb of data in the past 30 days and i didnt even send or receive any large attachements..just your regular old email with the usual spam filters.
My data usage of the last 30 days was 446 GB. A normal average internet user will consume maybe 5 to 10% of what i do.