As far as I know residential PG&E customers can't buy energy in spot market prices, or else there could be some innovative arbitrage opportunities, like only running bitcoin miners when power is cheap.
1. https://www.energy.gov/eere/articles/confronting-duck-curve-...
Bitcoin on the other hand is just a waste of energy
Some people think clothes driers or Christmas lights are a waste of energy, but it's not for them to decide how other people spend the energy they've paid for. Some people think those things are worth the energy cost and so they pay for it. That's their choice to make.