Traditionally there was the copy editing process done by the publisher, but automating this on a the-customer-is-always-right process would probably have left a lot of hard to digest classics no where to be found.
And seriously? Running a work of literature against a dictionary for other reasons than supervised spell-checking?
Literature is about expressiveness not about serfdom to grammar or spelling.
What about Neologisms? There would be no nerds without inventive authors like Seuss. http://flavorwire.com/291507/everyday-words-that-were-invent...
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There surely still is a need for copy editing, proper formatting and layout, which was almost never done by the author alone, and also requires a different skill set than that of a typical author. These are the services a publisher should offer, but doing this without involving the author for final approval is just false.
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see also:
https://en.wikipedia.org/wiki/Doublespeak
https://en.wikipedia.org/wiki/Solecism
https://en.wikipedia.org/wiki/Sic and https://en.wikipedia.org/wiki/Stet
https://en.wikipedia.org/wiki/Malapropism also Cacography