An obvious way to do this is how consumers can upload solar power to the grid, and it comes off their bill. With enough people involved, the compute version o

An obvious way to do this is how consumers can upload solar power to the grid, and it comes off their bill. With enough people involved, the compute version of this could be self-sustaining, and the infrastructure guys just take a wee percentage. They are unlikely to be replaced by purely free infrastructure, because money is involved (even if in the form of credits). If there was a shortage at particular time, some people might supply that themselves, for extra cash. Distributed compute supply = local compute supply, with latency advantages.