Not just a account, youtube requires a age of 13+ (in US) to be used at all as far as I know. This normally would have safely removed any legal problems as a parent allowing the child (The problem as far as I have heard was that youtube realized that there are a lot of to young (The problem with the FTC requiring content producers for youtube (13+) to label videos as "for kids" is that with the FTC rules a lot of videos which are not meant for kids and are never supposed to be delivered to kids now fall under this label and lose targeted advertisement money, which can be there major income.
E.g. there are a bunch of channels doing LEGO reviews for _adults_ (because surprise there are a lot of young adults which started to like LEGO again, parents and also that cray people thinking it's a good money investment). Now because they do LEGO reviews they will have to label this as a kids thing, even through the amount of kids on their channels is less then 2%.... Or basically any easy to understand since video gets practically demonetized, because it's naturally interesting for 12y olds and has nice animations etc. This videos are fine to be seen by kids, but the producers would prefer kids to be excluded as they need to earn money to at least cover production cost.
Also because officially there are not Also we should not forget that there is YT for kids, so if you produce (good) content targeted at kids this is where you should go.
So it's a pretty messed up situation. If you now consider who has very large influence over the FTC and who either hates the modern internet which made people stop watching classical cable, or would like to additional bill YT (more?) etc. it's doesn't seem likely to resolve in a reasonable way, at last I would be surprised. But then I have been surprised before so let's hope it ends not to bad.