> The big legal loophole is that the government needs a particularized warrant (per the 4th Amendment) to ask for any user data, but if the government buys commercial data, well, there's no warrant needed.

Right; but as far as I know Palantir don't sell commercial data. That's my beef with this whole Palantir conspiracy theory. I am far from pro-Palantir but it really feels like they're working as a shield for the pitchforks in this case.