OpenAI's Artist Rules Are Easier to Evade Than to Explain

Can an artist duplicate a style without violating rights?

Yes.

Then an AI duplicating style isn't inherently violating any rights either.

If you want to get them in the consumption of the content it gets murky quick. Have you every watched a pirated movie? Should you be convicted of that, or of sharing it?

Subsequently describing the movie to some else constitute sharing of it?