In fact, proprietary OSes already phone home so often it's just mind blowing. On the mobile camp, only GrapheneOS and niche Linux distributions like SailfishOS

In fact, proprietary OSes already phone home so often it's just mind blowing. On the mobile camp, only GrapheneOS and niche Linux distributions like SailfishOS are quiet if you inspect network traffic. The tools for client-side scanning are there, it's quite easy to implement total control.