Searching for Gunship Battle: Helicopter 3D v2.8.21 typically leads to modified APK files (Mods) that claim to offer "unlimited gold and money."
While not illegal per se, using mods can violate the game's terms of service. This can lead to consequences such as account bans. Ethically, it's a gray area, as it can disadvantage players who do not use mods. Searching for Gunship Battle: Helicopter 3D v2