Some previous discussion on Partiful and its Palantir ties:

https://news.ycombinator.com/item?id=45795104

I would say that the missing link in the discussion is that the valuable data they are mining is social networks and the fidelity of their data there is of a much higher fidelity than what FB or IG provides since these are in-person events, typically.

This is an entire arm of marketing research: https://www.sciencedirect.com/science/article/abs/pii/S01482...

Also all those data promises go out the window as soon as they are acquired. Then it's Privacy Policy updates with retroactive addendums. Would be very surprised if that wasn't the ultimate goal.