Squirrels don't really hoard in the sense trillionaires do ("gathering a great quantity for one's own private collection"), they take seeds and bury them all over the place, which is meaning #2 in the dictionary ("save in one's mind for a future need or use"). The squirrel and other animals eat them later, the 50+% nobody finds to eat can take root. That way, squirrels play an important role in seed dispersal for many species of tree.

I suppose the trillionaire analogy would be they themselves investing money.