We're always striving to give the best experience and appreciate any feedback, the YouTube lock is something we're still working on and whilst I know this isn't the answer you may be looking for, once we do have any new information we'll be sure to let everyone know.
YouTube being a place which (from what I understand) only 13 y/o plus should be using. Don't you think that it's irresponsible of those involved, to have removed such a lock from a family entertainment system??
Microsoft, for example, have a brilliant age restriction system in place on the Xbox One game system.
Why on earth would anyone think it's safe for YouTube to be free to use for all ages?? Do these people not have children?? How does someone make an official complaint about this? Seriously?