> Send them the only message that they will hear. Stop giving them your money.

Second order effects of this solution are not great either - being outside of the smartphone world means you're... outside. Network effects quickly push you out of social groups without neither you nor the group doing anything mean, it's just group dynamics.

The real issue is the device and services come in a package which cannot be separated or compartmentalized. It's basically impossible to say 'this device cannot access youtube/pornhub/...' because there's a million ways to get around restrictions.