There is an alternative: prohibit smart phones for youth. They can possess simple phones.

Parents can just do this. It's far more expensive to not do it.

When all the kids in school have a smart phone it’s extremely hard to be the one kid and parents that don’t.

So, so much easier and more effective if they’re just banned for all kids.

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prohibit all proprietary software

That won't help. They'll open-source it, and the addiction stays.

Haven't you heard about the four freedoms? The software which meets this criteria is totally safe.

Define a smartphone.