When decisions don't go their way, there's always someone to blame in the eyes of a given fandom, and that person is now James Gunn when it comes to all things DC.
Walter Hamada was once the number one target for the furious subset who constantly found their demands and campaigns ignored, occupying a position similar to that of Kathleen Kennedy at Lucasfilm, who always gets blasted on the internet whenever the ball goes down.
Even though the creator of The Suicide Squad and Peacemaker has stated numerous times that he had nothing to do with Titans or Doom Patrol being terminated following the end of their respective fourth seasons, the filmmaker and executive has nonetheless doubled down on offering an explanation to his detractors on the entertainment industry's inner workings.
DC Studios and feature films, according to Gunn, are left at the mercy of the authorities when it comes to the fate of such things as additional seasons and feature-length sequels. If HBO Max does not want to make Titans or Doom Patrol anymore, then there is nothing the co-CEO can do to sway that decision, even from his pay grade.
The addition of Netflix CEO Ted Sarandos saying he hadn't canceled any series he thought to be popular is less likely, though Gunn's staunchest critics will agree that it was a business decision made by the shared universe's new commander in chief.