exo ( https://github.com/exo-explore/exo ) allows you to cluster your devices to run AI, it's only a matter of time before people start sharing compute, you setup a VPN server running exo, then each device you want to contribute to the cluster you route to that VPN - a group of 5 friends doing this would essentially provide a decent level of compute for running AI at literally no cost (excluding the vpn server which could just be a dirt cheap one)