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By ingame currency do you mean a crypto being used inside a game to purchase digital goods? Ive always been reserved around doing that as it presents a pay to win opportunity, unless of course you make only certain items which have little more then cosmetic effect purchasable.

The same way other digital goods are purchased on games. Roblox for example had billions spent on in game items in the last few years, seems like a great use for a cryptocurrency. Easy way to get real money into the game.