Stone is a two time Oscar winner for best director.
They love him in Hollywood. Funding is no problem.
That’s not true, his recent spate of bad movies that have done horrible at the box office has him out of favor.
World Trade Center was made with controversy because it was his chance to get back in the good graces of Hollywood, if I’m not mistaken he had a tough time getting the nod to direct it.
There are other reasons that I have forgotten but Stone is definitely not someone who can get big budgets from a studio.