You fail to understand just how good kids are at getting around restrictions. This despite having been a kid yourself who would have found ways around it.

Often we don't really have the power we want either. It is easy to say ban everything. However realistically that isn't the correct answer, too much school work really is on devices - often provided by the school so I can't lock them (except for the limited controls the school gives to us - if the correct app works on our devices that then we are expected to have). Every week some new hole in their block app gets spread around school - until the school figures it out and blocks it all the kids have it.

The only think unique about the above is devices. I guarantee if you go back 3000 years in history you will find parents complaining about their kids in similar ways.