Twitter user George_TeamLHwas the one who noticed the absence of the video on the YouTube page of the Warner Bros. Discovery streaming platform:
“The MAX YouTube channel has deleted the first trailer of ‘Zack Snyder’s Justice League’ which was the most popular video they had at around 31M+ views.”

Fortunately,Screen Rant was able to find outthe reason behind what happened. The outlet revealed that the studio confirmed to them that the reason behind the disappearance of the trailer is due to a music rights issue, and that they have had to hide it and keep it private until they manage to resolve the conflict.
It is currently unclear whether this is the same issue facing the movie itself, but it seems a very drastic move, although not an unprecedented one. In the last few years, the arrival of many older TV shows on various streaming platforms has seen some episodes being released late or dropped entirely in certain territories due to music rights causing problems.
While this kind of removal is usually resolved relatively quickly, especially for big movies, whether music rights are the sole reason for the removal is yet to be confirmed. One thing that seems unlikely is that this removal is permanent and anything to do with Warner Bros. Discovery’s cost cutting, as that would have likely seen the movie removed from all territories.
Zack Snyder’s Justice Leaguehas a runtime of four hours and two minutes, doubling the duration of the version that was seen in theaters in 2017. This is because under the vision of the original director each hero of the group had the chance to tell their story in depth, further exploring the ties between the characters to build a more believable bond between them, as Snyder’s goal was for them to found theJustice Leagueand in the sequel work together to fight crime already as an established team.
The movie starred Henry Cavill as Clark Kent/Superman, Ben Affleck as Bruce Wayne/Batman, Gal Gadot as Diana Prince/Wonder Woman, Jason Momoa as Arthur Curry/Aquaman, Ray Fisher as Victor Stone/Cyborg, Ezra Miller as Barry Allen/The Flash.