Removing phones doesn't remove a means of bullying, it removes a magnifier and multiplier of bullying.
There's lots of ways to capture bullying. But it might be hot water right? What if it was a watch with a camera? What if it was a camera alone? :)
Bullying is serious enough it can't be conflated with the desires of device manufacturers and social media platforms to manufacture young consumers of their feeds.
An issue here is the unfiltered internet is not capable of raising children, as much as they want to be exposed to everything, it doesn't work out the same for every child based on a whole host of independent factors than those who take the position above.