After the greatest blowup in the cryptocurrency business prompted 

calls for greater regulation, crypto exchange FTX

filed for U.S. bankruptcy protection on Friday

and its creator Sam Bankman-Fried resigned as CEO.

Traders hurried to remove $6 billion from the struggling cryptocurrency

 trading platform in only 72 hours, while rival exchange Binance

abandoned a potential rescue arrangement this week

making it difficult for the company to raise billions to prevent collapse.