Vanguard is a service that manages your portfolio so you don't have to. Literally the definition of providing an economic service.
Owning the portfolio does come with risk, but it's not fixed odds, rather the odds track the literal economy. If you buy index funds, your ballot tracks the value of the country you invested in. When society does well, so do you. And guess what? Everyone, including the government, spends their life trying to generate value and wealth.
It isn't a casino. Likening the US economy to a casino is perhaps the most disingenuous nonsense I've heard from the church of crypto.