Tarrifs are billionaire cash grabs

Not really. It is possible that Musk envisioned breaking NA auto pact to USMCA agreements on autos for purposes of destroying big 3 auto competition, which has been releasing competitive EVs prior to this aggression. Most billionaires like the status quo with existing protections of their business.

A depression does permit billionaires to swoop in later to buy assets. Complete chaos, uncertainty, and yo yo policies does allow for people to make huge short term leveraged returns if they know when the chaos is to be reversed and applied.

In this case, its just a cult leader doing stupid cult actions, though chaos profit angle can easily be there.