It's not just Facebook. Every sales, marketing, or product person in the world basically has an unlimited appetite for data and will push to suck up as much data as possible.

There is a logical reason for this: one of the toughest things is knowing what your users actually want and what their actual pain points are. In advertising there's an analogous problem often summarized as: "I know I am wasting 80% of my ad spend, but I don't know which 80%."

Every single incentive on the business side incentivizes data grabbing. This will never change unless users vote hard with their wallets or unless there is protective legislation.