I'd say more like some slimy poison frog, toxic, nasty and only care about themselves while smearing themselves all over the place. Looks great from a distance tho.

Or, they are a self-aware trolley that eats run-over people after choosing to switch tracks to where a bunch of people are tied down.

I think more similar descriptions can be found, but as for what they really are: definitely not the economy immune system cleaning up the remains of dead companies. They are just predatory wealth hoarders. But it's all legal and I'm sure the people making lots of money don't emphatise with the rest of the humans, otherwise they might not be doing it.