Yeah. Which I definitely see as having become a thing once Facebook started to become a thing. My teachers, for example, were really diligent about teaching us netiquette and how information moves in the internet (i.e. once it moves, you can assume it can be found forever because at no step is it guaranteed that it isn't copied). I've had people express shock when I explain that the only thing stopping all of their personal data and messages and calls made online from being recorded was because the service providers promised they wouldn't.

They've never made such promises about the services we've been discussing -- in fact! The opposite has happened!! They often explicitly say that they'll be using the data "anonymously" to do all the same things with it that people get worked up about when they know their names can be connected to it.