How do you get that through to someone who doesn't even understand that mass surveillance and profiling is a problem? Or to young people who have only lived in a society of mass surveillance?

Problem is that even not using those apps, the apps you currently use might have turned more hostile.

It wasn't technically feasible to scan personal chats easily, other than grepping keywords which must have had a bajillion false positives. Now you can get everything autoscanned at scale.