I can tell you that consistency in gambling doesn’t always guarantee profits, betting outcomes are full of randomness, and it depends on probability, being consistent does not always mean you will win, and stopping doesn’t mean you have made a mistake either. The fact that the code kept winning after he quit does not really prove anything, its just how things happen sometimes. Luck, timing, and a bit of chance can make everything look strange, but thats the nature of gambling. Since he wasn't winning much and he has quit, I will say that is good for him, most people will be losing and dont event know when to quit, so good for your friend.