MVC has nothing to do with this. Many applications were made in very clean MVC patterns that are difficult/impossible to use programmatically by outside code. Further, even poorly-written web applications by people who don't know what MVC is can be queried by a screen scraper.
"There is no shame in being self-taught, only in not trying to learn in the first place." -- Atrus, Myst: The Book of D'ni.
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