An overreliance on government contracts is turning out to be a headwind for BigBear.ai.BigBear.ai (BBAI 8.79%) has lately been popular among investors looking to buy artificial intelligence (AI) software stocks at reasonable valuations. That's not too surprising, as the company seems to be following Palantir Technologies' (PLTR 3.52%) playbook in the generative AI software market.Palantir initially made its name by supplying analytics solutions to U.S. intelligence agencies and the Defense Department, and i ...