The trains cost money to run so you are using resources you haven’t paid for.
And media costs money to make.
If I wasn’t going to buy it anyway they haven’t lost anything.
If you weren't going to buy it, why would you pirate it? That's the thing, if you're interested enough in a product to want it, then you taking it for free is a cost to the producer.
If you streamed it from their servers for free using an exploit that would be stealing, as you’ve actually cost them resources.
How do you think scene groups get their materials in the first place? They just find it on a flash drive on a park bench?
More often than not, scene releases are gathered internally by rogue employees in the studio who took something and distributed it in a way that they were not authorized to do. The origins of any movie you pirate come from theft, full stop.