Don't think this film is so complicated, let's keep it simple, there is only one meaning.
Efforts and resistance are useless, beauty and satisfaction come from God's reward. All you can do is keep betting on black over and over again.
A basketball player, a talented girl, three old loan sharks, and the strange car owner, rewarded him at the same time at the end. It's that simple.
As for why he was rewarded, then let me ask you, why did you always want to reward him with freedom so that he could say "fuck you" when you were watching a movie?
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