Do parents do not exist? I mean if the parents pass hours looking at their phone, the kids would want to use a phone, maybe making a law is easier than setting

Do parents do not exist? I mean if the parents pass hours looking at their phone, the kids would want to use a phone, maybe making a law is easier than setting an example? Each parent could educate themselves and bloc "harmful" websites from their kids phones, that is what parental control is for.(single, no kids)