Cyber Attackers Crash Muni Computer System Across SF

The entire message read, “You Hacked, ALL Data Encrypted. Contact For Key(cryptom27@yandex.com)ID:681 ,Enter.”

http://www.sfexaminer.com/hacked-appears-muni-stations-fare-...

Using an email account seems suboptimal. Why not do it over Bitcoin or other digital currency?