I have no idea what you base this statement on. You are absolutely likely to go to zero by continuously making market trades as a retail investor. Every trade has two sides and the side you're trading against is for the most part significantly better informed than you. That's why Robinhood makes its money by selling their 100% retail order volume.
The same is true for Blackjack. The house has a 0.5% edge if played properly, so as long as you're not making bets that are most of your capital, it'll take a long time to go bankrupt.