Comment by Derek_MK

It was definitely for the banking trojan he created and sold, that would later become Kronos. That said, he also became sort of a public figure in the field due to stopping the initial strain of Wannacry, so news articles were popping up talking about how he was at least tangentially related to Wannacry, and was recently arrested for malware charges. People saw that and started drawing the false conclusion that he created Wannacry.