Is this cash or compute? Elon has one of the world's biggest compute clusters spun up, and little inference demand to speak of.

Trading billions worth of idle compute, in exchange for a high-strike call option on the #3 player in the most-promising-vertical for AI, plus (presmuably) some access to their data, starts to sound like not a bad trade. Especially if you're pre-committed to betting your entire rocket company on winning in AI, and you're currently in sixth or seventh place.