Bitcoin's price swings are so huge that even ransomware developers are dialling back their reliance on the currency, according to researchers at cybersecurity firm Proofpoint. From a report: Over the last quarter of 2017, researchers saw a fall of 73% in payment demands denominated in bitcoin. When demanding money to unlock a victim's data, cybercriminals are now more likely to simply ask for a figure in US dollars, or a local currency, than specify a sum of bitcoin. Just like conventional salespeople, ransomware developers pay careful attention to the prices they charge. Some criminals offer discounts depending on the region the victim is in, offering cheaper unlocking to residents of developing nations, while others use an escalating price to encourage users to pay quickly and without overthinking things. But a rapidly oscillating bitcoin price plays havoc with those goals, Proofpoint says.