One of the main reasons Warner Bros. doesn’t want to help is because there was another Justice League made.
After his documentary on Miller’s Justice League gets finished, perhaps Unicomb can make a part two, exploring the behind-the-scenes drama that led to Zack Snyder’s Justice League meeting a similar fate.
But that movie, originally directed by Zack Snyder, has caused some major speed bumps in getting the Justice League Mortal documentary completed.
The proposed Justice League movie under Miller would have kickstarted the DCEU around the same time as the MCU.