When a website fails to adhere to the many interlocking metrics imposed by the Google search engine's ranking algorithms, Google typically sees fit to let its many other automated systems penalize the site's SERP placements. Since Google is effectively policing the Internet for an entire global population, it obviously has to employ automated functions to routinely scan countless websites and assess them based on metrics set up to determine whether they are high-authority domains.
Ideally, the job of reviewing a website would be carried out by a human being who would exhibit analytical reasoning beyond the scope of what AI can manage, but it is impossible for hundreds of millions of websites to each receive even a perfunctory assessment from a Google professional. The need for algorithms to mechanically grade websites is the primary driving force behind SEO as an industry because websites hoping for higher SERP rankings must adjust their content and structure to satisfy the lopsided standards of machines.
It may surprise site owners to learn, however, that Google does indeed assign live employees to look at choice websites and assess them personally to make sure that those sites are not getting away with degenerate design tactics that the ranking algorithms may have overlooked. If a Google employee determines that a website is not living up to the corporate giant's listed quality standards, then they will issue a manual penalty. "Thin content" is one of the most commonly cited reasons that site owners will receive when Google notifies them. This typically indicates that the site has pages without relevant text-based content accompanying their links.
If the owner of a website that was manually penalized for thin content is considering launching a replacement website, then they can take their old site off the web and wait several months for the content that Google previously indexed to drop off the search listings. By that point, it should be safe to post the best articles from the old site onto the new one. "Thin content" manual penalties should not target these articles when they are, in fact, examples of fleshed-out content. For more information click here https://www.reddit.com/r/SEO/comments/n3rfps/canireusecontentfrommypenalized_site/.