What I also do not understand from that blog is how feasible it is to convert an Ethereum rig to a PlayKey rig.
Typical Ethereum rigs have multiple GPUs but barely any CPU power, a small amount of RAM and some of them run from USB sticks. If they run SSDs, they are usually the smallest ones , meaning there is little space left for double digit gigabyte game data, let alone games occupying 100 gigabyte or more.
Let's say you have 6 GPUs and you want to serve 6 gamers simultaneously. I think the rig will be bottlecapped by the things mentioned above.