I remember when I was a kid there wern't a lot of cartoons to watch on TV, and the ones that were on TV would repeat a lot. I knew all of them by heart but I never got bored of them. Kids can watch one thing a hundred times without getting bored. That's where the majority of those views come from.
Adults, on the other hand, get annoyed by these videos pretty fast. A friend of mine was babysitting his sister's kids for a weekend and after that he came to my house. At the same time, my neighbors were celebrating their grandson's birthday and when my friend heard the songs they played he started cursing loudly.
The big problem here is the tendency of parents to leave their toddlers with a phone or a tablet in order to keep them busy. I think it can have a big impact on children's development.