The comparison to SETI@home[1] is that you just need the same mount of total processing power, not the same supercomputer setup.
People don't need to own A100s, they just need to be willing to be part of a distributed supercomputer by running a background app that downloads chunks of data, processes them, and sends the result back. The utility comes from having enough people participate (which worked quite well for SETI@home, but helping find "signals from outer space" is a little bit more interesting than "helping train an LLM")
