Exactly, Steam got where it is because it managed to be more convenient than piracy (as Gaben himself said, piracy is a service problem), as did Netflix before the fragmentation (and rampant enshittification) of the streaming market made piracy once more the most convenient (and better quality) option.

Epic store exclusives don't promote Epic, they promote piracy, as that is the second most convenient option after Steam (it's worth mentioning that Steam also acts as unobtrusive DRM; infect your game with malware like Denuvo and suddenly piracy again becomes the more convenient — even the only reasonable — option, as cracked games perform better and are more stable than malware DRM infected ones; Steam provides a good enough and, more importantly, harmless option for both consumers and developers, something no alternative, including piracy, has managed to achieve).

And, of course, the instant Gaben retires and Valve goes public and begins to enshittify itself we won't be going to Epic or GOG (unless they manage to replicate what Steam has achieved), we'll be back to sailing the high seas.