"When I spoke to Millennials to ask about whether they're concerned about tracking, they said, 'We have nothing to hide so we don't care,'"
I can answer this one. That's because, for those of us that have been in the industry for years, whilst they may know all the device swipes and have all of the social media posting skills they actually know fuck all about IT in general and are attributed with false competence by most people.
I have a boss who espouses the "nothing to hide" line and I think they're a f*cking idiot. Just pure laziness of thought. You have nothing to hide until such point you realise that something you considered innocent/innocuous got used against you. Then it's too late.
My kids have been well drilled in the evils of "social" media. It's an ongoing process as they constantly need to be reminded that you don't get something for nothing and the more attractive the free service is the likelier the more invasive it is.