[inflatableDodo]

What if it good at trading but can be unlucky?

[bumby]

Then I'd say the probabilistic nature of the model was not represented correctly by the seller.

Saying the algorithm makes 95% winning trades may not mean much if those remaining 5% of trades cause you to lose most of your value.

[inflatableDodo]

Protip, do not try this argument in Vegas.

[bumby]

Good point, but at least the probabilities of casino games are generally known and available AFAIK. People just tend to not care or have a confidence bias.

[Loughla]

If it's a robot, designed, programmed appropriately, and trained using the correct data to digest and understand later data, can it be unlucky?

[inflatableDodo]

John Maynard Keynes' remark that 'the market can remain irrational longer than you can remain solvent', springs immediately to mind.

[pbhjpbhj]

Yes, unlucky just means that random/arbitrary decisions or events didn't "favour" you.