Kids with phones are alright. Attention economy of social media is not. As did tabaco companies, they (soc. media tech giants) push proposals to regulate phone use based on age in hopes that the their information asymmetry advantage and addictive dark patterns that are the problem in the first place won't be regulated and they can keep exploiting the public held in their trap by network effect.
The scale is completely different. It's like arguing a bomb, a gun and a knife are exactly the same thing and we shouldn't bother thinking about where we draw the legality line