It's a bit sad that cryptocurrencies tend to encourage concentration and centralisation. It's very hard for an individual to take part and earn if you "miss the time". And the negative side effects are large, like energy expense, or selling out of GPUs.

I think this is a general shortcoming of proof-of-work. I wonder if this could be fixed with a different scheme, e.g. reputation-based, or proof-of-(something socially desirable and not centralizable)?