This view is very US-centric.
In most of the "rest of the world", netflix either doesn't exist or has a very very limited show list (even here, in a relatively developed EU country), and piracy literally is the only way to get a lot of the very popular shows.
And if you already pirate 3 of the 5 shows that you watch, why would you pay for the other 2, that are available on netflix, if you can just pirate those too?