If you wanted to do something like this you could put the charger on one of those electrical plugs with a timer, or a smart plug that’s switched on when the battery reaches a certain threshold

Models are getting more efficient and hardware is getting more powerful, it’s completely feasible that open source, self hosted, GPT4 equivalent and better models will be completely viable to run as individuals for reasonable costs (hundreds, not thousands) in the not too distant future.

As always, the will and knowledge to use the tools falls to the individual.