Most games are entertaining because they improve overall fitness so we're rewarded with a dopamine hit for positive reinforcement:

toys - develops mental capacity of infants

sports - improves health outcomes and/or teamwork

playing poker - trains models of decision under uncertainty

Now, Bitcoin mining - ?

Bitcoin mining provides security for a global, decentralized currency / payment system.

If we disagree on the value Bitcoin provides to society, then we'll disagree on the power usage. The value Bitcoin provides to society isn't, and shouldn't, be judged on any specific point in time or it's unsuitability at it's core function or whatever else, it should, and will eventually, be judged on the disruption and change it brings. For better or worse.

lol this is literally all false. toys - no, the gi-joe does not improve anyone's mental capacity. sports - are mostly played because people all over the world spend billions per year watching them. the athletes who play them end up with a damaged body, permanent injuries, and lots of back problems after 30. playing poker - the old man losing his house in vegas is training. gotcha. now, bitcoin mining - people want to do it, people are paying money for the energy to do it, and that's all you need to know.