I mean, the Original/Dark Horde pledged allegiance to the Legion in exchange for power and the knowledge to turn members of the Shadow Council into Warlocks.
Gulādan made āa pactā with the Legion and Archimonde went so far as to allow himself to die to hurl the Grand Warlock through the Dark Portal to uphold that pact.
Pacts with the Legion, and presumably with the other Primal Powers, are all binding in some form or fashion. Despite the Frost Wolves refusing to partake in the Blood of Mannoroth, they still assumed a green-skinned form because they were āpartā of the Horde, and thus the pact between the Legion and the Orcs was in full effect. It took longer to affect them due to the lack of physically imbibing that power, but it still happened.
As you said, Bwonsamdi also loves to make ādealsā and while you can wriggle around a bit, inevitably, you will pay up your end of the contract, one way or another. It was so powerful that even Talanji was unable to resist or remove the pact between her father and Bwonsamdi even after learning the truth of her fatherās actions.
Thus far there doesnāt seem to be an ironclad āyou signed on the dotted line now you have to do Xā system like what Settings such as D&D and Warhammer have made āmainstreamā in modern Fantasy/Sci-Fi, although that could be a fascinating thing to have to deal with, a here-to-fore unknown cosmic species that works to collect debts on behalf of the Primal Powers, and considering how the Champions of Azeroth have mixed and matched Fel, Void, Light, Arcane and even Death over the years to keep their world safe, having a bunch of cosmic entities that are the inverse of the Dreadlords, being unaffected by the Primal Powers rather than able to adapt to them as the Dreadlords do, showing up and insisting on exacting debt collection on the vast majorities of the players, and itās not a financial collection theyāre talking about.
And considering everybody has used these Primal Powers, either as class abilities, legendary items or magical relics, thereās a good chance every single Champion, from Mages and Priests down to Rogues, Hunters and Warriors, might be targeted and have to find out a way to get around the unnatural ānullificationā abilities of the Collectors.
