The URL is marked as UNSAFE / SPAM what does this mean?

DeveloperSharing
Help ID: 62
We use a number of different vectors to determine if URL links on our Community Platform have a likelyhood of being unsafe, or are spam - both are against our Community & Content Policies

You can still click through to these links, but please take additional precautions (up-to-date antivirus, antimalware, etc).