What went wrong with The Seven Deadly Sins Anime?

Everyone seems to be aware of the tragedy of The Seven Deadly Sins anime, if not here's everything that went wrong with the anime.

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In your opinion, what destroyed The Seven Deadly Sins anime? - Quora

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In your opinion, what destroyed The Seven Deadly Sins anime? - Quora

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Why do people say that season three of Seven Deadly Sins is bad? I saw no problem besides the slightly lowered quality of animation. - Quora

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What went wrong with The Seven Deadly Sins Anime?