As noted by Variety, all this drama reportedly stems from how very genuinely mad Nolan got at Warner, which had previously produced every one of his films since Insomnia, over their treatment of his 2020 sci-fi thriller Tenet.

Christopher Nolan left Warner Bros. due to prior issues and chose Universal for his film 'Oppenheimer', valuing creative control and marketing strategy over money. The decision paid off, with the R-rated film grossing approximately $976 million worldwide.

Newly appointed film execs Michael DeLuca and Pamela Abdy were chomping at the bit to woo Nolan back after he’d jumped ship to Universal to create Oppenheimer.