It can be called a miracle: about the series' newest season game of Thrones Nothing has been leaked beforehand. This was different in previous seasons, when full episodes and scripts ran out online too.
With the movie Avengers: End of the Game was hit. About five minutes from Marvel's latest superhero movie leaked. A catastrophe for the producer, who did everything to prevent leaks.
In this video, NOS explains in 3 how companies do this and what went wrong in the past: