That is insane. How are they even getting away with such a scheme? Did they start out at a 1:1 ratio and change it once network effects and lock-in happened.
In literally all other games I know of the ratio is 1:0 since you can't cash out their in-game currency at all. Do you have any of example of a game or a platform where you can sell the in-game currency for the purchase price?
The closest I can think of are systems like Eve, where players can trade in-game currency for game time tokens purchased by other players. 1:1 ratio, but the real money is proxied by game time so that no one can actually remove cash.