Unmetered electric service based on "trust me bro" is actually the default (at least in the US) for a huge variety of devices, like streetlights, cell towers mounted to electric poles, public irrigation systems, etc etc.

Almost every US utility has a "UM" process to self-assess an unmetered load's consumption and be billed. So, yes, it's not only viable but widespread.

> Unmetered electric service based on "trust me bro" is actually the default (at least in the US) for a huge variety of devices

I wouldn't talk too loud about this or you will ruin it for all of us. If I discover the street lights on my street mine botcoins I will blame you.