Much like the Olympians, the Greek Chthonic gods were hurting a quarter century ago. The Gods were effectively dead, and Persephone had to rely upon modern goddess worship to garner any essence at all, and Hecate (who was the real breadwinner of Erebus) had reached an agreement with both Beleth and Kronos to spread nightmares and teach magic (respectively).
This has, of course, changed with both the increasing acceptance (and disregard) of wicca and the the emergence of modern Helenism.
Hades has now returned to Erebus much as Zeus returned to Olympus. It may not be the same Hades, but Ethereals being Ethereals, he has been allowed to “reclaim” his throne after his “wanderings.”
However, the power dynamics are still changed. Hades is essentially a figurehead, with Persephone doing most of the administration of the dead, and Hecate still bringing in the bulk of new Essence.
Game of the Year
All this changed again in 2018 when Zagreus re-emerged from complete obscurity. Backed by the power of Nybbas and Vapula, he has presented the Chthonic gods with a new source of Essence, not at all dependent upon Hecate and her often complex loyalties.
Though his ascendancy may be short lived, Zagreus is now easily the most powerful (if perhaps not the most experienced) of the Chthonic gods. Much like Hecate before him, he has made no real effort to take over the administration of the dead, and is happy to leave that task to Hades and Persephone.
Now that Hades is back and the Chthonic gods have Essence flowing in from four different Princes, it’s safe to assume that they’re looking for ways to reclaim the underworld that was theirs from Asmodeus.
Whether or not they have anything to offer the Prince of The Game is another matter entirely (and possibly the subject of a campaign).