This is called “distributed computing”. It’s very much a real thing, and very likely a very lucrative thing. Pixar uses it to render its movies on “render farms”. Numerical weather forecasting models use it to crunch numbers and get new weather forecasts as quickly as possible. Stock analysis firms use it.
Why again is it ridiculous?
I thought about this in December of 2012 when I got my first Tesla and wondered why it took so long for them to finally think about this.
Years ago I set up my personal computer as a distributed computing node as part of the “SETI@Home” project, which used the personal computing resources of thousands of idle, privately-owned computers to analyze radio signals from outer space and, through Fourier Transforms and other tricks, identify if any of them contained any interesting signs of extraterrestrial intelligent life.
It’s not ridiculous and makes perfect sense, and could actually be a service that Tesla opens. Someone who wants a lot of numbers crunched would hire Tesla for a computing job. If you agree, Tesla will use your FSD computer to do calculations while your car is parked in your garage. In return, Tesla pays you, in the form of Supercharger credits, or literally credits your account. Meanwhile Tesla skims a bit off the top. Millions of distributed GPUs available when needed—all reachable from Tesla’s servers. I can’t think of a single other company that could do this.
I would jump at that deal as a Tesla owner, and I think many people would.