That is only if you consider high-frequency trading investing. Which is very hard to, because on traditional investing timescales HFT is delta-neutral.
I mean, there isn't any evidence other than heresay.
3x leverage on VTI/VOO yields 20% annual return over the past 30 years.
Even you, a passive index fund investor, can do this in your Schwab/Fidelity account.
Now consider algorithmic prop trading firms with 10x, 20x leverage. You do the math.
For reference, most people take 5x leverage on their house (20% down payment).