Check if your website is safe for browsing as per Google's standards.
Google maintains a database of spam and phishing websites and tells the visitors as such whenever they try to log on. And with the majority Google enjoys as the top search engine, the infected website should be ready to kiss the organic traffic goodbye.
You might be hosting social engineering content that can trick people into something undesirable, like revealing credit card information or downloading spyware.
However, you might not always be the reason behind the issue. It can also result from a hack. But anyways, eradicating the root cause should be your top priority.
And contact services like SUCURI if you're not sure how to clean up your marked-unsafe website.
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