In these games, you typically purchase Nutaku Gold, which is then redeemed for an item (usually a Gatcha ticket), which then randomly awards you something. Nutaku could say, "You got exactly what you paid for, which is virtual currency used to buy a one-time consumable. Hope you enjoyed it!" You're not paying for a product or service with these games, and therefore Nutaku has no contractual obligation to guarantee your access.
Bragg v. Linden held that Bragg's terminated assets had real-life value. That was true because real-money-trading between users is part of the game design. Nutaku's games have no such feature, and it's not clear that the money paid for digital items is equivalent to their value, especially when the items are obtained via a lottery system and are bound to the account.
There's a very simple way to solve this problem: pressure companies like Nutaku to include such guarantees in their terms of service. If they don't play ball, boycott them. But good luck convincing a significant portion of the userbase to join your crusade. The community is too fragmented and most users are entirely apathetic to anything beyond their immediate gratification--this being porn and all.