The ratio of joules of energy to bitcoin mined isn't fixed; it's varied to keep the rate of bitcoin mining constant, although not from one day to the next. If the price of bitcoin goes up 20% in the next two weeks, then bitcoin mines that would have been running at a 10% loss start running at a 10% profit instead, which increases the hash rate and then the difficulty. This increases the amount of energy (and hardware investment) needed to mine bitcoin, which reduces the miners' profits, but disproportionately the profits of fossil-fuel-driven miners.
It's true that rapid price changes can make fossil-fueled mining temporarily profitable, and things like burning off flare gas are also profitable, but bitcoin mining is already dominated by renewables and becoming progressively more so: https://hbr.org/2021/05/how-much-energy-does-bitcoin-actuall...
I'm sorry I abbreviated this whole explanation so much in my original post that you ended up so confused.
It's true that rapid price changes can make fossil-fueled mining temporarily profitable, and things like burning off flare gas are also profitable, but bitcoin mining is already dominated by renewables and becoming progressively more so: https://hbr.org/2021/05/how-much-energy-does-bitcoin-actuall...
I'm sorry I abbreviated this whole explanation so much in my original post that you ended up so confused.