Google’s Phantom III update seems to have taken place around 2015 and addressed low-quality content produced by websites. This would hurt content mills the most, and while Google never officially announced the update, many sites were affected and saw a significant drop in their search rankings. Due to those sites generally having lower quality content, the Phantom III update is based on conjecture, but with strong evidence. And the lack of Google announcing the update lead to the update being called the Phantom III update.
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