I think it benefits state-owned clubs more than individual billionaires, because even billionaires often have to report to shareholders. Wes isn't a majority shareholder in Fortress (controlling interest has been sold a couple of times), so he doesn't have the clout to sponsor the club for anything other than fair value through that company, despite his shares being worth billions.
Same for Nassef, who I think owns less than 50% of his family company these days.
Compare this to state-owned clubs and companies, where it's often the same people who "own" the entity in its entirety. The can "choose" to sponsor Man City's stadium for £100m a year, without anyone blinking an eye