It's a pretty scary technology tbh. In a nearby city to me during the George Floyd protests, protestors got caught outside with police cars blocking streets. The police then decided to call a curfew of <definitely not enough time to gtfo of there> and arrested a lot of them. With technology like this they could actually trace back almost every single person who attended a protest like this and arrest them weeks or even months later
The ensuing shit storm wouldn't be worth it for them, not for something like this.
Nothing to read afaict.
Lots of provocative flight paths to look at.
See presenter notes
And nothing about their legitimacy, only about the scale.