That would be true if they used material that was paywalled. But the vast majority of the training information used is publicly available. There’s plenty of freely available books and information that you only require an internet connection for to access, and learn from.
This is an issue for the AI user though. And I do agree that needs to be more conscious in people’s minds. But I think time will change that. Perhaps when the photo camera came out there were some shmucks that took pictures of people’s artworks and claimed it as their own because the novelty of the technology allowed that for a bit, but eventually those people are properly differentiated from people properly using it.