Now I don’t know whether quantum theory “justifies” gambling or not. But this paragraph
Life itself is a gamble and a game of trial and error in which all humans are forced to participate. In matters of life, all humans win some and lose some. Living is mostly sowing and reaping, and often just investing while losing or gaining. Playing the slot machine by investing 25 cents with a chance to win $25,000 is much better odds than buying ordinary shares or otherwise investing $25,000 in a stock market with the chance of losing everything
certainly justifies why casinos make so much money! And, now that I think about it, I think the author was close, but not quite right. Quantum theory doesn’t justify gambling, but studying quantum theory might just justify gambling: because at least then the gambler would know what probabilities actually mean and how crummy a deal they might be getting.