It already exists as a curiosity: A toilet that uses waste as fuel for a bioreactor and pays "users" in a cryptocurrency: https://www.reuters.com/world/asia-pac

It already exists as a curiosity: A toilet that uses waste as fuel for a bioreactor and pays "users" in a cryptocurrency: https://www.reuters.com/world/asia-pacific/south-korean-toilet-turns-excrement-into-power-digital-currency-2021-07-09/ https://www.reuters.com/world/asia-pacific/south-korean-toil...