Everyone having a FaceTime call does this. Every dash cam does this. Every Ring doorbell and self driving car does this. You can do this with a $10 usb pinhole webcam and an android phone or raspberry Pi.
The problem here is with facial recognition databases, not with people using cameras in public.
Lol bruh, have some self reflection. People do it because it’s easier. If you have the time to have all the hobbies that other people have and to roll your own home servers that’s great, but that means you have an above average amount of free time. Otherwise, other people have hobbies that don’t include server OS updates and choose to spend their time there and pay for someone else to manage their servers.