My DD follows Whitney and Buttercup, has watched but doesn't follow Cheernastics2 and other channels that are less serious about gymnastics and more about reviewing things or getting clicks.
Buttercup is a similar age and (used to be) the same level so she liked following someone talking about what they were doing to score better at the same level, however Buttercup went from JO4 to JO8 in the last year so the videos have become less relevant.
When she started watching videos she was trying to do things like handstand on a beam and kip, so there were dozens of videos with little pointers for what worked for them, minimally seeing other girls work on the same skills motivate her to keep trying to get better at them, but there are no gymnastics secrets or great tips in any of the videos. As she progressed the YouTube videos became less about tutorials and more about fun routines to watch and different hair tips for meets. She doesn't really watch anything gymnastics anymore, maybe because the content is so sparse now or maybe she is just out of that phase.
