They call it illegal downloading or internet piracy.
Let's say it's illegal BUT do they really think we will buy those movies for such a ridiculously expensive price? Even people with above average salary won't do this.
Imagine more than two hundred bucks for a TV series and then later it goes to your shelves and will never comes out. Yes it is reusable for hundreds times!
The thing is, every person involved in the process of making, producing, starring and marketing the movie ridiculously makes enough money out of it that illegal downloading doesn't really affect them!
It's just that they want more money and suck our blood. And yes, eventually when it's tax time, those businesses know how to evade paying tax legally!!!