Close the game, go to your phone's settings, and change the date to one day ahead.
Websites promising "unlimited diamonds" or "money hacks" usually require you to complete "human verification" tasks or download unknown files. These are frequently scams designed to: Idle Bank Tycoon: Money Empire Hack
Re-opening the game triggers the "idle" reward as if 24 hours have passed, giving you a massive cash and lightbulb infusion. Close the game, go to your phone's settings,