In-app purchases allow players to progress faster in the game. However, it does not provide any advantage in competitive modes, such as Multiplayer or Limited-Time Events. The matchmaking in Multiplayer mode is not tied to a player's inventory, but to their skills (through Elo rating). Plus, the gameplay (i.e., races) is not monetized in any way, so, for example, users cannot purchase boosters to gain an advantage against their opponents.