Back in 2005, Safe Browsing was launhced to protect users from online sites serving malware, unwanted software, phishing, and social engineering policies by showing warnings when a user browser those sites, until Google verifies that the site is no longer harmful.
The verification can be triggered automatically, or at the request of the webmaster via the Search Console.
"Safe Browsing also notifies webmasters when their websites are compromised by malicious actors and helps them diagnose and resolve the problem so that their visitors stay safer," Google writes.
However, as of today, "some websites cease's harming users for a short window of time to have these violation warnings removed," Google said, and "will then revert to harmful activity, once the notification removed," added Google.
So, to fill this gap, today Google added a new type of violation notice to Safe Browsing for webmasters that will classify these sites as "Repeat Offenders."
Repeat Offenders are "websites those repeatedly switch between compliant and policy-violating behavior for the purpose of having a successful review and having warnings removed," Google stated.
Google said, when a site is determined as a Repeat Offender, the webmaster will be notified via Search Console email address. And, the webmaster will not be able to request additional reconsideration review request for 30 days, Google said. After, this 30–day waiting period, webmaster will be able to request a review.
However, users visiting the site will continue to see the warnings until the violation is removed.
Update 11/10: Google announced a new site for Safe Browsing, as single source of information available to users, developers, and webmasters.
The new Safe Browsing website will be a platform for consolidated policy and help content, Users will be able to quickly report malicious sites, access developer documentation, and find policies, google said.
The site also serves as a central hub for our tools, including the Transparency Report, Search Console, and Safe Browsing Alerts for Network Administrators.