And then consider drones, mobile devices. And then mass disinformation and/or disruption via LLMs.
As a long time advocate of old school mass action, and a believe in active protest movements as part of a healthy democracy, I have a strong feeling of unease. I've had it since about 9/11, but it's now really bad.
e.g. if you know, with certainty, that heading out to a protest could lead to your instant termination from your job because a drone passed over and took a photo and identified all 100,000 people in the crowd instantly.. would you still go?
Or if having been identified, some malevolent actor could just turn around and mass produce fake content from you and others in the crowd, to discredit you?
Shivers.