This is open model intended for local usage. So, it doesn't matter. If the end user wants to run this on their own hardware, cost is defined by the electricity

This is open model intended for local usage. So, it doesn't matter. If the end user wants to run this on their own hardware, cost is defined by the electricity price + the price of the processing power. Providers can increase the price as long as the users don't switch for buying the hardware themselves instead.