I have had to disable my !give command which I just had enabled for subs as I noticed some users with insane amount of points.
What I found out is that if they do a bank heist or other minigame, they can then !give the points to another user (their alt account, etc) before the heist actually starts, and get double points.
!bankheist 500
!give altaccount 500
give command does not take into effect that they just spent 500 on a bankheist. so now they have -500 points on the bot.