[SolaceQuantum]

This isn't necessarily true in the field of artistic production, in my opinion. In this case this person presumably submitted their work for acceptance to a company, and the company rejected their work but then stole it. This is a massive violation of industry ethics, and still generates much fury to this day if it happens. (For example, if Tor published a novella under an editor's name, but the novella was actually written by an author who was told the work was not accepted into Tor, this would cause a massive uproar.)

Part of the issue is that the publishing party purchases first-publishing rights of the work submitted to them. By definition, they need to recieve unpublished, highly protected work that hasn't been shown to anyone else (or shown to an audience).