It's the attitude and marketing. Maybe not "flagrant" but "ambitious," "aggressive," and "expansive." I don't know the name of any other public surveillance/camera company, but I've heard about Flock, and the same is probably true of any of my neighbors who are even the least bit tech-following. They are also ambitiously funded for growth and expansion and their outward press attitude is congruent.
Other camera companies would like to see steady year-over-year growth in camera sales. Flock would like to see the world blanketed in 24/7 surveillance.
They make themselves a lightning rod as a business strategy.
If Flock vanished off the Earth tomorrow I think we'd see exactly the same ALPR penetration. Municipalities aren't buying these things because Flock's so good at selling them; they're buying because the ALPR vendors have an extremely compelling pitch! Two of our neighboring municipalities have non-Flock ALPRs; I think you're going to see a lot of non-Flock ALPR penetration in progressive-leaning suburbs, for instance, because progressives are all het up about Flock.
(I helped get Flock cancelled in Oak Park, where I live, and before that led the passage of what I believe to be the most restrictive ALPR regs/ordinance package in the country. I'm not an ALPR booster.)
But I'm going to keep saying: my thing about this video is that he's describing mostly things that are true of all public IP cameras. There are zillions of those!