Typically the way it goes is that the studio underplays how much CGI they used during the marketing campaign, while the VFX vendors are forced to bite their ton

Typically the way it goes is that the studio underplays how much CGI they used during the marketing campaign, while the VFX vendors are forced to bite their tongues, and then 6 months after the movie debuts their NDA expires and they finally get to show how much CGI there really was. This series is a great watch on the subject: https://www.youtube.com/watch?v=7ttG90raCNo https://www.youtube.com/watch?v=7ttG90raCNo In the later parts there's some really egregious examples where promotional behind-the-scenes footage was actually doctored to key out the green screens or present composited shots as if they were done in-camera.