One problem is that Bitcoin has the most expensive energy cost for its consensus algorithm. https://www.wired.com/story/bitcoin-mining-guzzles-energyand-its-ca

One problem is that Bitcoin has the most expensive energy cost for its consensus algorithm. https://www.wired.com/story/bitcoin-mining-guzzles-energyand-its-carbon-footprint-just-keeps-growing/ https://www.wired.com/story/bitcoin-mining-guzzles-energyand... More generally, trust: https://www.schneier.com/blog/archives/2019/02/blockchain_and_.html https://www.schneier.com/blog/archives/2019/02/blockchain_an...