Constantly jumping from unstable stock to unstable stock is a great way to suddenly be down a great deal of money. Offsetting a 50% drop takes doubling your money afterwards and in that period you haven’t made anything so the next 50% drop puts you into a deeper hole.
As to too big to fail, the top of the market has a surprising amount of churn with many companies falling very far very quickly.
Instead the model that actually works is to buy companies, load up on debt, pay yourself from that, and then let the zombie crash and burn. Part of that process is goosing quarterly returns with deferred maintenance etc but the model depends on a sucker lending money rather than the market.