First simultaneous multiplatform film release – why did it take so long?

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I’ve never fully understood the reasons that film studios always release movies to the cinemas first, then rental, then DVD, then finally video-on-demand services and TV. It baffles me why they’d want to make it harder for consumers to enjoy their products, especially now that digital distribution means that there’s no reason why film studios can’t just let people buy a film as soon as it’s ready.