Note: This calendar view maps the number of captures of https://accounts.google.com/ServiceLogin?hl=en&service=youtube&continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Ffeature%3Dredirect_login%26hl%3Den%26app%3Ddesktop%26next%3D%252Fupload%26action_handle_signin%3Dtrue&passive=true&uilel=3, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.