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Most movie studios don't accept pitches of movies by strangers via mail, because they would get 1000's of pitches covering almost every possible topic. Then later when they make a movie that may be similar to one of those ideas, someone will come along as say "here I pitched that to you" and sue them.
It might be similar for other companies, unless you sign an contract stating upfront that you release all claims to the idea, before even telling them what it is.