How did these videos evolve to be the way that they are? Is it just titling with a combination of terms that kids are likely to hit in a search, plus colors/sou

How did these videos evolve to be the way that they are? Is it just titling with a combination of terms that kids are likely to hit in a search, plus colors/sounds/expressive faces/weird non-sequiturs that make kids laugh and watch the video to the end?