Why shouldn't he buy everything? He bought the U.S. (sarcasm, I hope)

OTOH, everything Trump threatens is an invitation to bribery.

And when it starts to go south for him, Elon's going under the bus, not to re-engineer them.

Trump's dream is to be the richest man in the world. Someone is in the way as soon as his hatchet man job is done. Nothing has any meaning to Trump but money.