> Further it can be used to shine a light on corrupt officials
Little Brother surveillance. It would be nice not to be surveilled at all, but since that's not an option the answer to "quis custodiet ipsos custodes?" is us.
As a kid in the 90's in a city of 150,000 people it was stupidly easy to do most of an entire day's adventures anonymously and with either very little or entirely no record of my presence and activities. Yes, there were some cameras here and there, but you knew where they were and could avoid them. Cash was still accepted everywhere, you didn't have a cell phone and definitely didn't need a cell phone to go about your daily activities[0].
I definitely was able to walk/bike/bus/carpool wherever I wanted all day long as young as 6 years old and no one gave a shit except my parents. If I was lost (which happened often!) I'd just ask an adult to help me find my parents. Adults generally interacted with me either only in a professional context (as a clerk/ice cream truck salesman/etc) or if I went up to them and explicitly let them know I wanted their help.
Not all my friends had the same level of freedom but most had enough to go to any of the parks in the nearby neighborhoods and play with friends until their individual family's established "curfew".
If kids stayed out past their curfew, one parent would call each of the other parents and the other parent would drive around the area parks looking for their kid. Another kid or parent would generally be able to point them in the right direction and clear it up within 30 minutes.
Occasionally my parents might forget to pick me up from sports practice and I'd sit outside the ice rink or school for 2-4 hours until they figured it out, usually in cases where I spent all my payphone quarters on food or arcade games.
Little Brother surveillance. It would be nice not to be surveilled at all, but since that's not an option the answer to "quis custodiet ipsos custodes?" is us.