Probably a phone OS would be the most impactful. If it had the ability to really cut back on tracking and data sharing by default.

But if you’re talking about building hardware… that feels like something the NSA would be happy to be involved with whether you want them to be or not. I’d vote for an 80/20 solution that gets people protected from some of the most rampant data mining going on by corporations vs. state actors.

The other issue to keep in mind is that the tech ecosystem absolutely will suffocate anything like this by disabling access to their apps / website with this OS. So at the end of the day I really don’t know if there’s a solution to any of this.