> Custody of the data remains with the customer.

Yea.. like.. how, though?

Here are their setup instructions. It seems pretty clear what is happening to your data, and an unqualified statement that you maintain some nebulous idea of "custody" seems oblivious to even simple risk.

https://www.palantir.com/docs/foundry/data-connection/initia...

This isn't even getting into their "forward deployed software engineers" or how that whole aspect of their "product" works.