Well as you can see from the screenname, that's not my account. I'll pass the message along, but it seems like I remember N.S.B. saying it's to avoid massive copyright infringement that YouTube scours new videos for. It's almost like if you initially upload it as unlisted, they'll let you post it to your account, but if you upload it as public right away it'll block the publicizing of said video if it detects copyrighted songs. I'll send along your message to NotSkinnyBenny and see if he (or she?) can make it public here in a sec.