>and the spam is - as this tweet points - appalling. Incentives. If the expected value of a single spam message is in the micropennies, then you have to send e

>and the spam is - as this tweet points - appalling. Incentives. If the expected value of a single spam message is in the micropennies, then you have to send enormous volumes of them, which can easily be detected by automated tools. Cryptocurrency changes this. Now an account hack can net the attacker millions of dollars. This means you can send many fewer messages and invest much more time in each of them.