That's pretty shit ping if you wanna game, and mobile carriers are notoriously enforcing data caps
A mobile carrier would really have to change the data usage part if they want non gamer home streamers to get on board.
Yea, you'll need something to connect to their network and convert it to your home network also, so there's that cost that could creep in as well.
I worked with T-Mobile briefly, they were pretty fair about their data caps and they did enforce them. Before it happened there would be an email or two plus a bunch of text messages. At the time people hitting the caps were being either extraordinarily cheap like buying a prepaid unlimited usage hotspot and opting out of data for their entire families devices and only use the WiFi hotspot for all their data.
Another common one was a student from China or India Skyping their friends back home for hours per day.
But yeah the T-Mobile offer isn’t that attractive but it would be for a guy who has satellite or lives in whatever shitty broadband wasteland.
5G broadband will definitely get better.
I assume the mobile gateway is the thing that acted as a router, that appeared to be free but it carried a $207 charge if cancelled and not returned. Again T-Mobile being fair $207 is a strange number I bet the thing costs them around $200 to buys and deploy them.