For YouTube and TikTok at least, a "creator middle class" isn't possible. People become popular on these platforms not so much for what they do but how they look.

Pokimane, for instance, doesn't have 6 million subscribers because she plays video games. She has 6 million subscribers because people find her attractive. The content she produces is incidental.

As long as the content produced involves the creators themselves, the most attractive people are going to bubble towards the top and take the largest slices of the creator pie, and that can't be changed.