one account having reputation low get this issue during post answer but able to answer that question having more reputation same network.
Your post cannot be submitted at this time due to the volume of spam and abuse originating from your network. We apologize for any inconvenience. See the help center for more.
This information about this is in the Help Center, https://drupal.stackexchange.com/help/abuse-block:
In an effort to maintain the quality of our collaboratively edited resources while imposing the fewest possible restrictions on who can create and edit content, Stack Exchange utilizes several layers of spam protection.
While our systems are still learning to trust new users, additional positing limits might be imposed if the system detects that a large amount of spam or abusive content has been posted from others utilizing your Internet provider in your area.
and for the particular message your friend saw:
It means that the abuse was extremely severe, and that we unfortunately can't accept your contribution until the abuse has subsided. Unfortunately, in most cases, this will mean that you need to contribute to the site from an alternate location until a few of your contributions have been well received by the community.
