It appears he is selling a service where he comes to you (optionally with a Mac Mini which is probably why he's buying multiple) and sets up OpenClaw for you.
They definitely do. A common configuration is running a supervisor model in the cloud and a much smaller model locally to churn on long running tasks. This frees Openclaw up to lavishly iterate on tool building without running through too many tokens.
There are few open source projects coming along that let you sell your compute power in a decentralized way. I don't know how genuine some of these are [0] but it could be the reason: people are just trying to make money.
There have been countless projects to sell distributed compute power. I don't know of any that have gotten much traction. Everyone keeps trying to create new ones instead of developing for the existing ones.
The one you linked to looks clearly like a pump-and-dump scam, though.
For example: https://x.com/michael_chomsky/status/2017686846910959668.