@Andrewcu
That will change, unfortunately.
The main problem with channels aimed at young children is this:
Unless the children's parents are also watching the same channels, these channels have no value to the advertiser community. Children have no income; and therefore no "buying power" for advertiser's products, and there is no guarantee that they can reliably nag their parents into buying advertisers' products for them.
But there are ads on tv during kids shows. Please show me one source (from YouTube or news website etc) saying that advertisers don't want to advertise on kids channels. Otherwise it's just speculation. As long as we're speculating, I have friends and family who do watch kids videos on YouTube with their kids, and I suspect many do.
Besides, I really can't imagine a channel a like Cocomelon (53M subscribers, aimed at toddlers) would ever get demonetised.
Now that I think about it, Baby Shark, a very popular kids song from another very big kids channel, was even in YouTube rewind.