you would pay roughly $479/mo on your free to drive car.
IF YOU HAVE TO PAY MONEY, IT IS NOT FREE!
Seriously, this is just stupid.
It says free to drive, not free to own. Many people who lease a brand new car pay more than $479 a month, and then pay for gas and parking on top of that (in many places like a few Californian cities, EVs park free). Careful throwing around that word "stupid".
Don't forget that the lifespan for the power inverters for solar is about 10 years. About the time you recoup your initial ROI you'll have to invest about 30-40% back into it AGAIN to replace them.
Except in this suggested scenario, you're renting the solar setup - so it's their problem when an inverter takes a dump. I don't think it's worth it for mining since $100/month would probably buy you juice for a lot of miners and you have to sign a 15 year lease on the equipment in most cases, and I just don't trust for an at-home setup to remain profitable for a decade and a half.