I don't know of role-model investors / traders who amassed a fortune in a short amount of time, starting from a small amount of capital, without borrowing money. There are of course cases like /u/DeepFuckingValue turning a few hundred grand into tens of millions with his massively bullish GME position, but in general, taking this much risk on almost guarantees that you are blow up in a few years.

I agree with Shkreli: if you want to "amass a fortune in a short amount of time" AND do so without taking on an unreasonable level of risk, then doing so with cheap cost-of-capital (e.g. investing friends&family wealth, using insurance float, gift cards) is the way to go.

But "making 10s of millions quickly" is a different statement than "active trading is not worth the effort".