Wireless is much cheaper in other countries. In Austria I can get a LTE flatrate (no hidden data limits, tethering allowed) for around 20-30 Dollars a month (depending on the speed, see https://www.drei.at/portal/de/privat/tarife/internet-tarife/...). The wireless carriers there compete with the cable providers and market their product as cable replacement. In the US the cheapest flatrate costs around 100 Dollars, and even then the amount of included data for tethering is still limited to some ridiculously low amount (I think something like 16 GB for T-Mobile).