I think this goes down to generation that were in high school when Snapchat came out (14 in 2013, so today's 20-year-olds). The generation currently in high school is much more moderate and circumspect about their technology use. Among my friends' middle-schoolers, they tend to use technology much more as a tool (learning to program is apparently now standard practice in late elementary school) and less as a way of life, and they value their privacy much more highly.

Possibly not coincidentally, that's the generation boundary: the divide between Millenials and Homelanders is usually placed between 1998 and 2001, based on whether you're old enough to have living memories of the time before 9/11. The first children born after 9/11 are entering college this month. It makes sense that the generation that grew up in the pervasive culture of fear since then would look at technology not through the lens of "How can this connect me to the rest of generally-benevolent humanity?" but through the lens of "How can this be used against me?"