[taurine]

There are not any, since there are no public stock market models worth copying, and no stock market model takes external input. But if they did (you could give a time-series to a model in the cloud, and it would give you predictions) then it would be possible.

Copying models is a problem for cloud-hosted pay-per-prediction image classification, not for constantly retrained stock market models that don't take external input.

[Bromskloss]

I thought it would be about observing the behaviour of a system that is trading on the market. The input to the system would consist, for example, of other people's trades.

[taurine]

It is referring to https://arxiv.org/abs/1609.02943

What you are referring to is possible, but is not "copying" per se, just trying to infer what the system is doing (inverse RL), and then exploit that/make it do mistakes. If you are not HFT it is very difficult to distinguish bots from humans, so you'd have a hard time even finding a target.