Infinite wealth exploits that the average person can exploit without getting into trouble. I could especially use this feature.
Though, a more serious answer would probably be something like infinite resources you find in certain games. For example, infinite weapons in games like Fallout 3, NV, and 4 from enemies periodically respawning when you’re gone. Or in sandbox games like minecraft, how you can easily get seemingly infinite trees and bonemeal without completely destroying the ecosystem.