Google has published its 2019 Spam Report.
https://webmasters.googleblog.com/2020/06/how-we-fought-search-spam-on-google.html
Along with that, an official blog has been published explaining the importance of eliminating spam.
https://www.blog.google/products/search/how-we-keep-spam-out-of-search/
Spam mimics a signal to get into the ranking system without providing high quality content or use technology that is harmful to searchers.
The following are some of the reasons why Google search is helpful
https://www.google.com/ search/howsearchworks/algorithms/
The following is a pick of the parts of the article that discusses Google’s spam detection and countermeasures against it.
CEO