I don't think there will be a rug pull, just a slow bleed as people see how much this is costing them and they leave and go someplace else. And then they ones that stayed till the end are absorbed into the GSCoin empire.
Sounds precisely like how many of were trapped in the [insert Southeast Asian government name]coin empire.
Pensions are a huge ponzi that has been limiting withdrawals to retirees slowly over the past decades. Government bonds keep raising interest so people feel less bad about cash stuck in schemes, and some actually are convinced to buy into longer, deeper locks. But every time it gets to critical point, some other foreign government invests more (think of this as GS) to share the risk, while money printing slaps on more band aids.
No realistic rug pull happening in our lifetimes but everyone bleeds, just a game of who has more blood to let before they pack up and go (literally) or simply live miserably into oblivion or go off grid and return to monke in our vast forests. My remote village has suddenly been seeing more newcomers in past few years when it had actually been in population decline since the 1970s.