The option to remove money was initially for my testing purpose.It has the option to ADD money. There are 3 options (-100, +100, and +500) that you can use. It isn't infinite by default, but you can get more than enough to buy anything you need with a couple clicks. To use it just open the laptop in Max's room, then click on the Mod icon and choose the amount to add. Not sure why there is the option to remove money, but it is there.
Hope that helps.
Decided to keep it there, should players want to grind the game (Hardcore mode) to earn money in Future!