There seems to be an inverse correlation between smart and evil in human beings which is reassuring, but only mildly.
Indeed, this isn't the first time ransomware with bad crypto has lead to a win for the good guys:
http://blog.cassidiancybersecurity.com/post/2014/02/Bitcrypt...
http://0xec.blogspot.com/2016/04/reversing-petya-ransomware-...