Do you honestly feel tricked that a gameplay mechanic which transparently asks you to record 50-100MB videos of a point-of-interest and upload it to their servers in exchange for an (often paid/premium) in-game reward was a form of data collection?
I don't think I've done any in PoGo (so I know it's very optional), but I've done plenty in Ingress, and I honestly don't see how it's possible to be surprised that it was contributing to something like this? It is hardly an intuitively native standalone gameplay mechanic in either game.
Oh yes, children, their primary market, definitely consider this. Definitely.