Not sure who this technology is aimed at.
They say it's to level the playing field with those who have state of the art gaming machines. But, to play most games at a reasonable speed, with relatively good graphics, you don't need a state of the art graphics machine. Yes, you do need a relatively up to date machine, but you don't need a machine with a cost of thousands. Those that do need machines that cost that much probably have them, although if they are true enthusiasts, they've probably built the "rig" up bit by bit, so the cost is actually spread out over several months.
If you are playing a game where you can win or lose based on the latency and slowdowns introduced by any graphics card, you are pretty much fucked if you introduce the latency introduced by throwing most home internet connections into the mix, especially when you introduce mobile telephony to it.
This system may function brilliantly when you have a gigabit connection to your router, then a nice, clean, 5G connection to the data centre, and almost no one is using it, but how will it cope when faced with an internet connection in a heavily populated town, where the only option is ADSL, and because of the distance from the exchange, the only ISPs available can only offer speeds in single digits? That's without factoring in that you are probably several hundred miles away from the nearest data centre.
I would argue that Nvidia don't really know who they are selling to. The kinds of people who need this power are, in my experience, usually the ones who have the £2,000 gaming rigs, so don't need to move the GPU work to the cloud.
The kinds of people who would use a service like this are more likely to go for consoles as they will be cheaper in the long run, and often don't really need the power of a system like this. But, as noted above, none of the current main consoles use Nvidia chips..