Hahahahaha.
Copying a digital file where nothing of value is lost is like stealing a car radio?
Man ....
As with a lot of things that are subscription-based, I feel that I am not so much paying for the product itself, but rather, I am paying to support the continued support and improvement of said product. The thing about digital content is that it tends to have high fixed costs but near zero marginal costs (in that it costs nothing to distribute). So you are not wrong in that the parent company isn't really disadvantaged by you pirating their content, but at the same time, it's also a very myopic way of looking at things.
For example, I am subscribed to a couple of newsletters (AboveAvalon, Stratechery, Macstories). My money helps to support these writers and make their business venture profitable enough that they continue to this for the long run. Sure, they probably make enough money that they won't really feel it if a few less people choose to subscribe or if I forward their emails to my friends, but there's always the risk that enough people may do do to make it no longer financially viable to continue with their business.
I subscribe to a number of apps because I like what they do and I want to support the developer so he can continue to support them for many years to come.
With a company like Netflix, my money is also helping to fund the creation of future content. At the scale at which the company operates, they probably won't miss a couple of million of dollars, but there's always the risk that if enough people turn to piracy, there may not be enough paying subscribers left, resulting in either less content, or less good content. A lot of things seem innocuous when it's just one person doing it, less so when everyone starts to think and act the same way (eg: think the 2016 US elections where less than half the country voted).
So while there is no real physical harm done to anybody, I won't go so far as to say that it is a victimless crime. There are rammifications.