On one hand, Palantir have (at best) questionable connections and I wouldn't be a rush to work for them. On the other, with the level of pay/benefits they provide, I'm not surprised they can find people without similar qualms (or people who overlook or aren't aware of them).

I won't share specifics (as they aren't mine to share), but I have a friend working for Palantir overseas. Once essential benefits (e.g. accommodation) are factored in, his salary is north of six figures (GBP). For someone only a few years past university, I imagine that sort of offer is difficult to refuse.