I think when people go against palantir, they are specifically against gotham - their govt/intelligence-only product. It is true that gotham is an app built on top of foundry just like any business builds on top of foundry. But in this case since palantir itself is the one building it (and heavily marketing it may I say) they get the bad rep for it.

If XYZ Inc. built gotham with palantir supplying them foundry, palantir can claim to be "just like postgres".

This all matters only if you're actually against gotham / automated surveillance, of course, and believe that it was not happening until alex karp.