Sure it is. With a chess AI you’re driving forward progress in neural networks, machine learning, and technology in general which pushes forward humanity in ways that are too numerous to count (even if you don’t buy into AI hype). With mining crypto, you’re hashing a bunch of things against a bunch of other things to make some imaginary things that people only assign value to because other people assign value to, in a tautology, ad infinitum. It’s a scourge on the environment and a waste of great minds, to the extent that those minds are devising new crypto, not to the extent that they’re buying a mining rig to mine crypto.