This is a false equivalence. Poker is a zero-sum game. Investing in the market is not.
Your alternatives to investing in the broad market of company stocks and bonds is putting your money in real estate, starting your own business, or personally invest in people who start businesses, or trading risk for return with annuities or life insurance, or keeping it in cash/money market which might not even match inflation. Alternatives to have significantly more risk, less growth, or require significantly more time or expertise, and may not have a tax advantage. Alternative pensions may essentially force you to stay in a job you don’t want, and are at the whims of the CEO or governor who may just decide to not fund it, or depend on whether the company will actually be around when you retire. No thank-you.