Why can’t commas replace colons in movie titles?

Question

We could just read it as (Movie title) and then (any other important information about the movie)

In: 0

Answer 1

Because commas and colons are used for different purposes.

Comma
a punctuation mark (,) indicating a pause between parts of a sentence. It is also used to separate items in a list and to mark the place of thousands in a large numeral

Colon
a punctuation mark (:) used to precede a list of items, a quotation, or an expansion or explanation.