Not enough. Preemptively passing laws that forbid this kind of mass surveillance. Like in Switzerland and other nice places.

Making the possession of data this either illegal or too horribly cumbersome.

Flock is just an iteration, and getting rid of that brand won't fix it. And camera tracking of normal citizens is just an iteration -- not the underlying systemic issue that isn't being addressed.

The EU has GDPR. At this point, I want something stronger than that.