A lot of us don't actually have to imagine anymore. ICE keeps harassing people in remarkably personal ways, like showing up at the homes of people who make a video of them

Exactly. That's time to pull the plug on the technology companies enabling this situation.

The data doesn't have to be in someone else's hands. The interface could just be the management and extra features that just stream the data from your device(s) to your mobile app. There's plenty of things that could be added as a service that would make a SaaS viable even if all of the data is stored locally on the user's devices.

Still someone else's control point.