A great moral crime, no doubt...
The problem is once you expand the definition of 'steal' well beyond what is legally considered theft, the immorality of "stealing" is no longer a given. People who accusatorily use the word in reference to copyright violation are leaning on the 'illegal acts of theft' meaning of the term to add apparent moral weight to their argument. But when challenged on that, they retreat into these more diverse meanings of the word and pretend they never meant it that specific way. It's a Motte-and-Bailey tactic.
> the actor "stole" the show
> A team has... "stolen" the game
These examples are all obviously metaphorical and irrelevant, unless you want to talk about metaphorically stealing from people, which I don't understand to be the point of this thread.
> Mallory "stole" his fiancé
Bob has been deprived of his fiancé.
> the rival company "stole" your secret formula
> crackers gain access... the data was "stolen"
These are the only two relevant examples, and they're sufficiently debatable that it's unlikely you'd be able to prosecute either for theft or larceny. In the case of the crackers breaching an email list, many laws are broken, but I doubt "theft," or anything like it, would be one of them. In the case of the corporate espionage, if this is theft, it's theft of intellectual property. And that makes it the most direct comparison to content piracy, but it doesn't advance the conversation because it's the same debate.
• Someone says they do not like cats and have no interest in having one as a pet. A cute stray kitten shows up on their doorstep, they take pity and feed it. They fall in love with it and keep it. They might say that the kitten "stole" their heart.
• An actor playing a minor role in a play gives a performance that outshines the performance of the stars. Many would say that the actor "stole" the show.
• An employee of a rival company poses as a janitor to gain access to your lab and takes a photo of a whiteboard containing the formula for a chemical that is a trade secret in your manufacturing process. It would be common to say that the rival company "stole" your secret formula.
• When crackers gain access to a company's list of customer email addresses, passwords, or credit card numbers, it is commonly said that the data was "stolen".
• Alice is Bob's fiancé. Mallory woos Alice without Bob's knowledge. Alice elopes with Mallory. Most would find it acceptable if Bob said that Mallory "stole" his fiancé.
• A team that has been behind since the start of the game but wins on a last second improbable play is often said to have "stolen" the game.