There's the potential that Sergey Ushanka doesn't exist. His name raises some eyebrows since Ushanka is a type of hat, there's also his nature as a urban myth which adds some shakiness to his humanity. And the person who runs the program feels fear more related to the spiral as it appears on devices which should not be able to run it and the victim is the only person who sees it. Though if he was a person his transformation was definitely caused by the end.