He just bought a massive data center with thousands of Nvidia boards. Why would the car be an efficient place to do the same work?
Question is: are there enough high latency distributed workloads to sell?
This is an unreliable spot instance at best, with none of the features one can normally attach to an instance (like storage, managed databases, ...). How fast can its Internet be? Will owners need to pay for Starlink too? (What about when parked indoors?)
It would have to be cheaper than all regular hosting options by a long shot for anyone to consider this. A very niche, low-paying market, in other words.
The point is it's just a way to use free compute that's sitting around, if you want to sign up to use it you'd obviously make sure it was in wifi range