surely they wouldnt have invested trillons on it if it was garbage

Oh, my sweet summer child.

“They” didn’t invest trillions of their own money in it. They invested a few million, built up some hype, and got other people to invest more, so now their millions are billions. And they are smart enough to sell before it all collapses.

They make their billions even though it’s garbage. Heck, they make billions because they know it’s garbage before everyone else does.