Nvidia's GeForce NOW cloud gaming service has been a popular way to access your games on the go without worrying about hardware. It has a free tier with titles like Fortnite, not even requiring a purchase, but the paid subscription enjoys much better specs and rate limits. As such, using the "Ultimate" tier, modder Zortos was able to gain full access to the Windows desktop inside GeForce NOW, allowing him to use it as a normal computer that can (ironically) run local AI models on it.
For context, GeForce NOW is only meant for gaming; Nvidia does not advertise it as a general, all-purpose cloud streamer like Shadow PC, for instance. Hence, doing all this is certainly against the terms of service, and you run the risk of your account getting banned. With that being said, ethically, you are paying for renting hardware, so trying to gain desktop access is predicated on how far your own moral scruples allow you to go.