This.
One topic I use to get people thinking more about implications is speeding.
Right now, in most places, there is balance. One can speed, and have reasons that are not to be judged at the moment, and there is some chance of it being detected and a ticket written.
Could just be simple error too. Glance down at speedo, see +15 over, think "oops", and correct with no real worries. Happens all the time.
Now, think about that android phone. Google actually knows when speeding happened, where, and all that. So far, the only action I have seen is Google alerting me to speed traps and a request for me to confirm they are still there.
But, where will that lead?
Does my insurer get that data? Can they get it? Should they get it?
Etc...
Then return to that balance bit.
Say one gets a ticket. With, what I call old world balance in play, the general response is to just be a bit more careful and avoid future tickets. Simple, easy, reasonable.
Now, with all that data collected, a ticket could be just the beginning. A review of your last year of driving reveals chronic behavior! To get past the ticket, monitoring is needed, your car may be required to limit speed to the legal limit at all times, and on it goes!
Same scenario, same person, but two very different outcomes and perceptions! Should there be. Why?
Or, say one is not popular politically, or got sucked into some sort of investigation just by poor timing and proximity, or maybe an unfortunate surname similarity.
What could happen?
One morning you get up to find your license to drive has been revoked and you owe a ton of fines. That happens despite never even being pulled over for years, or ever. Maybe it happens at random, like a drug test too.
One day, boom. Your life is forever different, because data.
All of us are extremely likely to be guilty enough to see the worst max penalty allowed for in the law too.
True right now, today for me, you, everyone we know who drives.
What should happen? Why? What public good does it serve?
These are questions of balance.
All of that mass data hoovering going on in pretty much all aspects of our lives is not balanced at all. The human factors we are accustomed to do not exist. The watchers are perfect. Or near perfect enough to be a concern.
The first time Google prompted me about a speed trap, I thought, "spiffy" and saw it as a nice help / value add to Maps.
Then later down the road I thought about where it can all lead. Nowhere good without some new rules, and even with those, trust is difficult.
Frankly, I want to put my phone in a faraday cage after thinking about it all. People vary in their responses, but I can say this line of discussion can often get them thinking about these matters and it is all pretty easy to talk about.
People, even those with light knowledge of these things, can picture their own driving, the phone, and potential outcomes.