Due to a poor test screening, David Ellison, a financier of Paramount, became concerned that the film was "too intellectual" and "too complicated" and demanded changes to make it appeal to a wider audience – including making Portman's character more sympathetic and changing the ending. Producer Scott Rudin sided with Garland in his desire to not alter the film, defending the film and refusing to take notes. Rudin had final cut.
On December 7, 2017, it was announced that due to the clashes between Rudin and Ellison, and the shift in Paramount's leadership, a deal was struck with Netflix handling international distribution. According to this deal, Paramount will handle the US and China release, while Netflix will begin streaming the film in other territories 17 days later.
Source : Wikipédia
(j'adore l'inquiétude quant au film trop intelligent et compliqué, c'est rassurant en fait)