Definitely we need more of these games. Even if they never shut down a game, it may have some people willing to pay so they can get access to an item elsewhere. It helps people play different games from the same developer.
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Universal NFTs are going to really enhance what you are envisioning I believe. Imagine a NFT that represents one thing in one game yet can be converted (swapped) for something else in another.
That enables you to retain your value in the NFT while switching games.
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