It's not stealing, it's copyright infringement. If someone steals my car I no longer have my car. If someone copies my car my car loses values because there is now one extra copy of my car floating around.
Edit: to be clear, I agree it's not 'theft', but am pushing back on the way this distinction is sometimes used to insinuate that it is victimless (not saying the poster above is claiming that, just that it's worth pointing out)
You can metaphorically say it's theft, but it doesn't manifest as theft of actual property.
For example: many people (myself included) have downloaded the $1.000.000 torrent (a list of files whose value amounts to a million dollars). I found nothing of use in it so I just deleted it. Did I cause a million dollars in damages? Was the damage restored when I deleted it?
If you consider the same for actual property there's no question about it. Stealing a Bugatti does cause millions to be lost, and destroying it makes it irrecoverable.
I get that you have legit reasons for feeling strongly about this topic, but this is way over the top, so please don't do it on HN. We want curious conversation here.