Yeah, from now on, in order to sign into your Youtube account you need to link it with your Google account. This is a big pain in the ass, because I didn't have one, and you have to enter a cell or phone number... They claim it's for "security" reasons, but I doubt it. This is just too extreme, especially for people that use their Gmail account regularly. What happens if their youtube account gets hacked? Their Gmail account is in risk.