Why? People are still taking measures to try to stop this, like setting up firewall rules to block SMB to the Internet.
20180521/https://en.wikipedia.org/wiki/WannaCry_ransomware_attack
20180521/https://en.wikipedia.org/wiki/File:Wana_Decrypt0r_screenshot.png
20180521/https://en.wikipedia.org/wiki/EternalBlue
20180521/https://en.wikipedia.org/wiki/Metasploit_Project