According to a study done by Parks Associates in 2015, 57% of U.S. households access an over-the-top video account, meaning streaming services like Netflix, Hulu or HBO Go, but 11% of Netflix subscribers, 10% of Hulu Plus subscribers and 5% of Amazon Prime Instant Video subscribers are using an account paid for by someone else.
Young adults between 18 and 24 are the biggest perpetrators of password sharing, with 22% of those surveyed admitting to using an account that was not theirs.
Parks Associates also estimates that "illicit password sharing" could cost the industry as much as $500 million per year.
From the article "Share A Netflix Password, Go To Jail?" by Stephen Pounds.