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Google quarantines around 10,000 suspicious websites every day and puts them on a "Google blacklist".
When a website is added to a blacklist it means that Google and different search engines and anti-virus companies are marking the website as not secure to visit.
There are several reasons why you would think that your site is a Google blacklist or URL blacklist. One, for example, is when you see your website traffic dropping rapidly. But it never hurts to check if your pages are still being indexed by Google.
Google uses specific algorithms and keeps updating the algorithms from time to time. If web crawlers label and categorize anything unsafe they will add the websites to the Google blacklist.