What are their complaints?

Things are hacked together, extremely difficult to change (without a pile of more hacks, Palantir is most interested in embedding itself deeper and manipulating RFPs than helping orgs operate more effectively, they waaaaaay overpromise during sales and can’t deliver, costs and timelines overrun by a lot, they’ll shift the goalposts by trying to sell the next Magic Fix before the first thing is finished (because they oversold/botched implementation) or has delivered value commensurate with its cost.