In the comics, Hunger was first made aware of the main Marvel Universe after Thanos first harnessed the Infinity Stones in his Infinity Gauntlet, making Hunger interested in devouring said dimension. But since entry into Earth-616 required that someone within said universe create a hole for Hunger to gain entrance, he manipulated the technology and thoughts of Galactus, leading the latter to believe that the Infinity Stones could permanently end his need to consume the energies of living planets. So upon gathering the Stones from both inside and outside the universe, Galactus assembled them in a crux that instead opened a gateway to the great Cosmic Vortex, where Hunger resides. Thanos's timely intervention destroyed the gateway, though, scattering the Stones across the universe again, but left a very small portion of Hunger alive within his reality.
Well, perhaps when Thanos finally amassed the Stones here in the M.C.U. during the Infinity War, Hunger sought to consume Earth-199999 as well. Then again, though, with the Stones now destroyed, any chance at entering this dimension might be remote, if not nonexistent. But you never know. He might even manipulate the M.C.U.'s Galactus to use some other form of tech to give him entry to this dimension. And with Thanos now gone, perhaps Galactus could realize what he did and destroy whatever he tech he might use that will bring Hunger to it, banishing him back to the Vortex. (Obviously, these are just notions, so we don't know if we'll ever see Hunger in the M.C.U.; but his apocalyptic capabilities, I think, might make him a worthy opponent for the heroes of Earth-199999).
