Yep, you're right.. but it is nice that young people put their own playing whole world to see!
...well, let's get it right: chances are, it's their parents that put videos of their music performances for the whole world to see. I'm not sure whether it is to satisfy their parents' ego or if it is actually good for their musical development.
Either way, I feel universally sorry for those who are tied up in this because their parents forced them to. I have friends who study piano seriously because their parents forced them to. They play the piano very well indeed (I mean, one will be very good when one practises 4 hours a day weekdays and 8 hours a day weekends from a very young age), but they know very little about music aside from that which they've learned. And if they do not have the interest and/or the talent, I also find that they are musically unintelligent - no musical intuition, relying solely on what their teachers tell them about each and every note.
Anyway, if you enjoy it, great I suppose. And for sure not all these kids are like that - there are obviously kids that like it and do it with conducive support from their parents. It's just my personal opinion that sometimes music is almost like the 21st century form of child labour...