Although there are better reasons to reject crypto, energy usage for crypto has few benefits aside of speculation/gambling for material gain. In Europe, energy bills for most people have tripled so reducing energy demand is a priority right now. I think there are less harmful ways to gamble. You could try a casino perhaps or buy futures contracts on ornamental gourds.
Just because it's not very useful today, it doesn't mean it's not useful ever.
Reminds me of people that were sure the Internet wouldn't go anywhere in the 80s. Technologies don't have to necessarily be useful on day 1 or even 1000 to be eventually successful.
