Piracy was never stealing, it was only copyright infringement.
Stealing is a crime that goes back to the 10 commandments, it's old. When you steal something you take it from someone else, depriving them of it.
Copyright infringement is a newish crime where the government has granted a megacorporation a 120 year monopoly on the expression of an idea. If you infringe that copyright, they still have the original, and can keep selling copies of that original to everyone else, but they might miss out on the opportunity to make a sale to you. Obviously, that's very different from stealing something.