Humans have been playing games literally for thousands of years - there is a value in entertainment, especially with our busy lives of 21st century.
You can of course overdo it, turn it into an addiction and it can destroy your life - like many other things.
Crypto trading is as valuable as trading scraps of paper with a dollar sign scribbled on it - if it were done for fun or entertainment, then sure, whatever, but it's having major impact on our energy consumption and has to be curbed.
PS - also, a small side note - literally no gaming rig uses an "upwards of a thousands watts". Even fitted with the highest rated components currently available on the market(say a 12th gen i9 + RTX3090) you won't be using 1000W of power. Consoles use about 200-300W under full load, and that's a bigger gaming market than PC. And then the biggest gaming market is mobile - larger than PC and consoles combined, and the energy consumption there is tiny. So you're massively off base here.
>>Honestly I think providing an alternative financial system is more practical than most of the other energy intensive things we do these days.
And I honestly think that anyone who thinks crypto will become "an alternative financial system" and not just a pyramid scheme is lying to themselves.