- the theatre chains only have mostly generic datasets (the audience for movie X is mostly young white males) while MoviePass can do far more detailed analysis (and, in theory, could pass detailed questionnaires after you watched a movie, thus gathering more personalized data)
- online movie booking services (at least in my social bubble) are only used for movies where people think they don't have a chance to get a ticket without an early reservation
- movie review sites only have tiny bits of data about the readers, and the reviewer dataset is skewed - it only provides data about the people caring enough to do a review.