This way to acquire assets is statistically working, but it's very slow; it takes decades, unless you actively trade and maybe have some not entirely public insights into the businesses you invest in.

Also, an investor risks to lose the investment when the market crashes. Not everyone thinks about that during a market rally though; during these it looks like you can keep making tons of money for a long time.

I'd say that investing in a car repair shop and the appropriate skills would likely pay more, that is, would produce more assets faster.