The amount of oil is small enough that it would have absolutely no measurable effect whatsoever on Puget Sound.
Would you say that it is therefore OK for me to dump it in the ditch?
I'd say no - because it's decreasing the intrinsic value of a shared resource (whether or not it can be measured). Downloading a movie, on the other hand - doesn't decrease the intrinsic value of the media being copied.
A ride requires a vehicle, a driver, fuel, etc. You can’t freely copy a vehicle, a person’s time, or the fuel required to power the vehicle.
A theater requires electricity, seating, space for seating, an audio and video system, etc. These are also things that you can’t freely copy.
Not everyone is a A-List celeb or director.
The legal term you're looking for is probably "theft of services", e.g. https://definitions.uslegal.com/t/theft-of-services/).
And, to the people trying to play semantic games with "steal" and "theft", theft of services does have laws defining it as a criminal offense, e.g. https://oregon.public.law/statutes/ors_164.125 .
Edit: Call it digital trespass then. I don't really care what you call it. There are obviously fixed costs to creating content. Just because there aren't incremental costs incurred from piracy, doesn't mean there isn't harm. Lost revenue is harm.