Bandwidth has nothing to do with latency. A low-Earth orbit satellite connection could have 20 Mb/s bandwidth, but the latency on the round-trip for the packets could be 800ms, technically still under a second...but completely unplayable.
That's not the problem. You can have a "watchable" [0] video stream with 1mbit/s.
It is a problem with Stadia, because Google says you should have at least 10mbit/s