Netmarble (the developer) uses server-side checks for currency. Because gold and crystals are tracked on their servers, "unlimited" mods are often detected instantly, leading to a permanent account ban.
Having unlimited gold and crystals removes the "grind." You can instantly max out your favorite characters like Thor, Iron Man, or Jean Grey. While this is fun for a few minutes of power fantasy, it often makes the game feel hollow since the primary goal of the game—progression—is gone.
The flashy skill animations and boss fights remain impressive, but without the challenge of managing resources, the tactical depth of the game's RPG elements is lost. Technical & Safety Risks