The only place I’ve seen it viable was in a speed test in Los Angeles on Verizon mmwave that achieved 6ms latency on input.
That’s in addition to the controller, bluetooth, and device input lag. This 6ms is experienced both in the video feedback and in the button presses.
In certain games this lag can hamper the experience. I know with 12-16ms ping I still hit cars and walls I shouldn’t have in driving games which I figured would be the easiest to stream.
Maybe fiber could achieve a less perceptible latency, but I can’t imagine that rolling out faster than some people will be able to render it natively on a low end device.
Do we know the data centers are rendering the games on Linux? It’s entirely possible they spin up ephemeral stripped down windows vms to host the sessions.