Google's @johnmu on giving prior notice to a Google Search penalty (manual action vs algorithmic change???) https://www.seroundtable.com/google-prior-notice-to-search-penalties-38497.html
Google's @johnmu on giving prior notice to a Google Search penalty (manual action vs algorithmic change???) https://www.seroundtable.com/google-prior-notice-to-search-penalties-38497.html