It's called Fartcoin. It's totally useless. So why is it now worth $700 million?

The carnival-casino era of cryptocurrencies has come back with a vengeance. Yes, it’s called Fartcoin. Yes, it is totally useless. And yes, it has nevertheless tripled in value over the past week to a market capitalization of more than $700 million — about equal to those of Office Depot, Guess …