If crypto wasn't contributing causing a crash in the GPU market and contributing even more to climate change, I don't think it would have nearly as much hate as it does. Sure it's largely used for scams and money laundering, but at least it's used for scams and money laundering in a way I can ignore.
Right now Bitcoin and Etherium, the leading cryptocoins, are absurdly slow and expensive, on top of causing all sorts of issues. Maybe blockchain is the technology of the future, maybe there are smaller coins, but right not whenever I hear "crypto" it's always something bad. Actually carrying this out and switching to a system which doesn't lead to absurd amounts of wasted computation is a great start to actual crypto usefulness.