Phones too.
I had teens before smart phones, we saw the txt bullying.
We saw the press from all the other teens to have a phone, some had multiple phones (from god knows where) so when their parents "took the phone off them" the carried on regardless.
One of my sons friends went sideways because she got caught up in sexual bullying.
The billionaires KNOW that it's easier to ket kids addicted when they are developing , that dopamine hit, it changes the way the brain functions. They are developing "customers for life". They are no batter than drug dealers giving kids a little bit of weed and growing their dependence from there, customers for life.
They are no different to big tobacco, they knew they product was addictive, caused cancer and lung disease, so they lied, they ran media campaigns about "personal responsibility", there was simply too much money on that table for them to walk away from.