Zack Snyder has been pretty integral to the DCEU, for better or worse, since it started with Man Of Steel.
He was a producer on Wonder Woman, Suicide Squad, will act again in the same role on Aquaman, Gotham City Sirens, the Suicide Squad sequel, the Wonder Woman sequel, and Deadshot. As well as this, he directed Batman v Superman: Dawn Of Justice and Justice League, with reshoots being handled by Joss Whedon.
However, in a tweetstorm by entertainment journalist Josh Dickey - whose previous writing jobs included Variety, Mashable, TMZ, and The Wrap - the official story doesn't match the real story. According to Dickey, and later by Collider's Matt Goldberg, Snyder was fired from Justice League. The official statement at the time of Snyder's exit was that he was leaving to deal with the suicide of his teenage daughter, and it's clearly understandable that he'd leave the project behind for that reason.
However, Collider's report backing up Dickey has it that Snyder's firing was not only open knowledge, but that Snyder's version of Justice League was "unwatchable," according to two separate sources who spoke to Collider.
Here's the original tweet from Dickey.
Since I'm shifting into DGAF mode, here's a hot one for ya: Zack Snyder was fired from the DCEU just over 1 year ago. Couldn't write it ~quite~ that way at the time, but was able to tapdance around it [clumsy/oblique headline not mine] https://t.co/7cht70rCaG
— Josh L. Dickey (@JLDlite) February 10, 2018
Obviously, Snyder's personal situation played a part in why this story was kept out of circulation and the end result was ultimately the same - Snyder was out, Whedon was in. Snyder clearly still has some involvement in the DCEU, as he's still acting as an Executive Producer on the the films listed earlier, and IMDb lists Snyder as the director to helm Justice League 2, so he's obviously not done yet.
Whether or not the story is true is, when you come right down to it, irrelevant. Justice League was terrible, performed poorly at the box office and Snyder's reason for leaving - whether fired or not - made no impact on any of it.
Via Collider / Twitter