You'd be surprised, though, how often people forget that. Working without a trusted central authority and permissioning is extraordinarily expensive and wastef

You'd be surprised, though, how often people forget that. Working without a trusted central authority and permissioning is extraordinarily expensive and wasteful. Think about it, the actual useful compute power of Bitcoin (or Ethereum) is about what one average computer can do. But because of massive duplication (can't trust the other one) plus PoW, you need around 100,000,000 times the compute power. The real question then is when or under what circumstances it is worth it, and that question is not being asked enough.