It's our culture. Everything we create, we create as a society, so to restrict access to our shared culture is the immoral act. That's the philosophical take anyway.

Practically speaking, we're living under feudalism capitalism, so we have to consider that the creation of art (movies, games, images, etc.) all comes at a financial cost, so acting as if those costs aren't borne by others is, I would argue anyway, unethical.

So the position I usually take is that if the group making the thing is small, the Right thing to do is to pay for it, while if it's a big multinational cultural glutton like Disney, they can eat a bag of dicks. As far as I'm concerned, pirate the shit out of that.

The interesting dilemma for me comes with the question: once you've purchased work from the Little Guy, is it ethical to seed it or just sneakernet it with others? Usually I fall on the side of "yes" on this, because small organisations also need exposure, and getting something for free is often the way in. I know that's how I got into a bunch of books for example.