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Writing a script is not considered as Starting a film.
It is not a film until it is out of pre and into full production.
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Then in that case your statistic is wonky. There is no way that 80% of films that go into production are cancelled, simply because the studios have already put in millions of dollars in developing the script, doing pre-production, hiring actors and crew, the list goes on. Once the film has started production, firing all those people and wasting that work would cost almost as much as finishing the film.
See, the documentary Lost in La Mancha is interesting simply because it is so rare for that many things to go wrong that production is cancelled entirely.