I'm of the opinion that only something radical like a new platform and/or device shift (i.e. away from smartphones to some other form factor, or a new, open, ne

I'm of the opinion that only something radical like a new platform and/or device shift (i.e. away from smartphones to some other form factor, or a new, open, network-local-by-default mobile operating system) is likely to save us from this. All contemporary smartphones leak a ton via DNS and various background sync processes. Perhaps scrappy developers from emerging markets are more egregious in violating expected norms, but these outcomes are pervasive at the moment across the whole ecosystem.