Maybe it's a 5D chess move to generate investor pressure on them to not spend that much.

Nah, more like a 1D chess move. Investors will pay them to invest in AI, so invest in AI, make the stock go up, sell, and leave the dumb investors holding the bag.

2D chess if they're smart: start a new company that competes with the one they just sold to dumb investors. Jack Dorsey is particularly fond of this move.