You could do a lot of that by many other means: Simple cell phone tracking will tell you everywhere people go and everyone they meet. Plenty of apps track geolocation; data on hosted servers and the wire have plenty more data, etc.
Nothing tells a story like high quality video though. Just imagine a story told via cell phone tracking of a CEO and known prostitutes phone traveling to a hotel together vs satellite/drone video feed (at a high quality the US government uses, not the grainy stuff they and this guy are releasing) .
I could choose not to have a phone I couldn't choose to not be on the street.
I once met someone who spent a few weeks in custody for choosing not to have his phone with him. It's not always a choice ;)
What? Was he charged directly because he wasn't reachable on his cell phone?
its probably fair to say that both can be used: cellphones for indoor and outdoor tracking, airborne video for outdoor tracking.