Since WannaCry is somewhat neutered at the moment (thanks to the killswitch), and this tool stops working after a reboot, I'd say this tool is somewhat useless,

Since WannaCry is somewhat neutered at the moment (thanks to the killswitch), and this tool stops working after a reboot, I'd say this tool is somewhat useless, with no intention to insult the man who created it. It's just the circumstances. After a week, almost all victims have rebooted their PCs or the memory has been re-written with other data.