Google's Site Reputation Abuse Policy, Explained
Briefly

Google's new site reputation abuse policy targets third-party content manipulation in search rankings, imposing penalties through manual actions and future algorithmic detections.
Google defined site reputation abuse as 'when third-party pages are published with little or no first-party oversight,' primarily aimed at sites manipulating search rankings.
The manual penalty applies only to sections hosting third-party content, not the entire site, but Google plans to enhance detection through algorithms.
Once penalized under this new policy, there is no recovery. Even shifting content to a new subdomain or directory worsens the penalty.
Read at Practical Ecommerce
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