It opens the door for someone to backdoor your car, phone, TV, iOT-thing to observe you. Give your GF a kitted out phone and monitor what she does when she is not with you. Install equipment in your shared car to livestream her activity. Governments constantly watching the street for criminal activity - such as drug dealing. Industrial espionage.
You could just set the cameras up, record everything, feed the images and corroborating evidence (phone ID, online connections etc) to your programs and let them flag "noteworthy activity". The problem is that each successive generation allows the creep of control to get ever greater because they find that which they were born into to be an acceptable baseline.
As a programmer and holder of 2 tech degrees myself I do not want to be monitored 24/7 without my express permission because I have nothing to gain from undesired monitoring and lots to lose.
Even now quite aside from your online activities offline- companies are teaming up with tech companies to tie ID and credit cards to online profiles, US immigration is requesting social media accounts, employers are spying on social media behind vetting pretexts etc.
If you think that those companies are not going to push to extend (officially or not) video of footage of you in the wild "in your natural habitat" you are kidding. Already in china that have citizenship scores attained by virtue of your online and offline behaviour using facial recognition. Heck half of the world is willingly deliver their face maps to the telcos as we speak - face ID. And before you say that the West is not like china try and live like you did 12 months ago and see what happens to you. Needs must ..
Why give a bunch of companies (and authorities) which have shown that the will actively work to flout privacy even more latitude to do so is beyond me.
Google mapped all wifi routers along with their photographing of the world's streets. Google follows you on the majority of the large websites and follows your location even when you turn location services off. Why would a company which has been repeatedly fined for breaking privacy laws be trusted with the means to collect even more live data?
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etc etc ]