As a thought experiment, say that the idea someday becomes mainstream that there is no reason to read any book or research publication because you can just ask an AI to describe and quote at length from the contents of anything you might want to read. In such a future, I think it's reasonable to predict that there would be less incentive to publish and thus less people publishing things.
In that case, I would argue the "hurt" is primarily to society as a whole, and also to people who might have otherwise enjoyed a career in writing.
Having said that, I don't think we're particularly close to living in that future. For one thing I'd say that the ability to receive compensation from holding a copyright doesn't seem to be the most important incentive for people to create things (written or otherwise), though it is for some people. But mostly, I just don't think this idea of chatting with an AI instead of reading things is very mainstream, maybe at least in part because it isn't very easy to get them to quote at length. What I don't know is whether this is likely to change or how quickly.
