
According to Bloomberg's report, the main reasons attributed to the failure of Rocksteady's Suicide Squad: Kill the Justice League game were:
These factors, along with multiple delays and a $200 million loss for Warner Bros., contributed to the game's underwhelming performance and negative reception.

Rocksteady initially shifted from developing an original multiplayer puzzle-solving game to focusing on Suicide Squad due to a decision by the studio co-founders, Jamie Walker and Sefton Hill4. They believed that working on Suicide Squad presented a better opportunity than creating something entirely new from scratch. Their intention was for the game to be released in 2019 or 2020. However, as we now know, the development faced multiple delays. This shift in focus was also influenced by Warner Bros., which persuaded the studio to turn Suicide Squad into an online multiplayer game with live-service content, following the success of games like Destiny and League of Legends.

During the earnings call last month, Warner Bros. reported a $200 million loss related to the Suicide Squad game.