Remember it's not their money that they don't know what to do with, the investors are the ones with money they don't know what to do with. That's why they bet on technology stocks.

Zuckerberg and Musk have no choice but to be seen loudly investing in the latest cutting-edge technologies in order to keep their stock pumped. To fail to do this is to have the brand rot, the growth collapse, and the whole scheme come crashing to down like a house of cards.