It really depends how smart the kid is. I don’t see the problem with a smart 9 year old uploading gameplay videos if it’s done right. As long as it’s supervised by the parent, the parent approves what the kid can upload and limit how many videos the kid can upload in a month. Comments can be turned off and they just use an internet nickname instead of their real name. Kid can even wear a mask to hide his face. Like it can be used as a learning tool to teach a kid how to use a pc and software, how to stay safe on the internet and what privacy means. Also how to plan and develop patience and discipline.

Of course I doubt these parents did any of that.