It has nothing to do with Meta's social media business. Zuckerberg, like many other top tech executives, has concluded AGI/ASI is in striking distance. If he could somehow win the race, he becomes god (or so he thinks, anyway). And from the perspective of a man whose idol is Julius Caesar, what wouldn't you spend for that chance?
This seems like it lands in the "most uncharitable" side of the "guess why someone is doing something I don't understand" spectrum. My razors tell me this is usually not the most plausible answer.
