That being said, I think it's generally a positive thing. Teen Boss isn't replacing kids reading the WSJ, it's replacing tweens swooning over boy band photos in Tiger Beat.
YT/Streaming isn't without its weirdness, but it's significantly more participatory and encouraging of people creating and making things as an alternative to purely consuming media.
I'd rather my daughter want to make YouTube videos and open an Etsy shop with her designs than mindlessly watch Hannah Montana (which I feel like is the equivalent from a decade ago).
As a peek into this world, check out Rosanna Pansino (Nerdy Nummies YT channel) and how successful she is:
https://www.youtube.com/watch?v=6i2cebTn0nc
There are worse role models for kids.