The creator won’t always be the writer or even the showrunner. Erik Kripke, for example, was the creator of Supernatural but he’s left by Season 6 and Gamble became the showrunner. While she’s the new head honcho of the show, she’s still not the creator of it so Kripke still gets the ‘created by’ credit even if he’s no longer involved in the show.
A movie is a single thing. How exactly you want to define “created by” and who fits that definition may vary from film to film (sometimes it would be the writer (possibly of some earlier source material), sometimes a director, sometimes a producer, etc.), but you can be pretty confident that the person responsible for creating the movie is going to get some major credit on it.
A TV show is a series of smaller things. It may last a long time or have multiple episodes in simultaneous production. It’s quite likely that the person who created the show will not work on every episode. For this reason, it’s more common for each episode to have a “created by” credit to acknowledge that initial contribution.
Who would get the “created by” credit on a movie? If you’re a screenwriter and you sell a film script to a studio, it’s very common for other writers to be hired to touch up that script or write entirely new drafts of it. By the time the movie gets made there might not be much left of your original draft.
On top of what other people have said, the various Hollywood guilds have very strict rules about how credits work. It affects how much people have to be paid in royalties so it’s strictly enforced.
That’s why you see so many different ways of introducing actors in opening credits. Even for the same show. Staring, featuring, guest star, etc.
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