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You are still off the mark. Profiting off someone else's work is not theft. Maybe a crime, maybe immoral, but it's a separate concept. Theft specifically is bad because you lose something you have. Copyright infringement is considered bad because we want people to be incentivised to create original stuff, and we want people to feel like if they create original stuff, they get to have special rights over it.

You don't steal an IP by piracy, you infringe on it. If you stole it, the original owner would not have it. The whole argument around theft and piracy is that by equating theft with piracy, we get to a false dichotomy that if we don't prosecute the random pirate or OpenAI for infringing on copyright, we can't prosecute car thieves or wage thieves or whatever either in all fairness. Which is not true. Societies with the concept of property but without the concept of copyright did and do exist.

It's all fair if you say copyright should be protected, and infringement punished, but it's as much not theft as it is not murder. I mean, since you harm IPs by piracy, and one can argue excessive piracy can "kill" an IP, would making a pirate copy be assault with a deadly weapon? Or vandalism? That's why words have meanings, and different things have different names.