It's not cheating to hire the workers you unceremoniously fired to save money asshole. It's called capitalism.
Then again, every super wealthy capitalist doesn't actually want capitalism. They want feudalism, where nobody else is allowed to compete with them and if someone makes them angry they can banish them from society without trial.
Usually they don't allow competition, this one is a bit special because it involves two billionaires and it's basically a show-off.
The regular case is: they buy any potential competitor in an early stage and let it die. The 5% of the start-up CEOs that don't just take the few hundred millions will face a nasty attack where they steal employees or do some negative marketing or whatever sabotage fits.