Niantic was always open with the fact that they gather location data, particularly in places cars can't go - I remember an early blog post saying as much before they were unbundled from Google. No one was tricked, they were just not paying attention.
They were pretty up-front about it bring a technology demo for a game engine they were building. It was obvious from the start that they would build future games on the same platform.
Facebook has been around something like a decade, now? I forget the exact number, but it's been long enough that everyone should have learned their lesson at this point; if you are creating data, be it personal, geospatial or otherwise, by using a product expect that data to be used as a commodity by the makes of said product.