Dilliha, Who Bought His Rig For $250 On Ebay, Has Turned a Profit Of $180 so Far. Some 60 Percent Of Mining Traffic Originates From Computers With Ip Addresses Linked To Colleges And Universities, Vectra Found, With Health Care Is The Next Highest Industry For Mining Traffic At Only 3 Percent. That Means College Students ? Or In Some Cases, Hackers ? Are Mining Crypto From Their Dorm Rooms In Massive Amounts Taking Advantage Of The Free Electricity.