[cltby]

> (and unless you are a crook, there is not)

What sort of shenanigans do you think profitable automated traders are engaged in?

[worik]

Insider trading

Market rigging

Survivor bias (not shenanigans that one)

[User3456335]

Insider trading: there's a lot of information freely available that can be used to make predictions

Market rigging: the market can be affected by your behaviour without you rigging anything

Survivorship bias: this can be argued for any competitive industry. Don't engage in it unless you're good at it.