I doubt.
[1.] He is looking to increase his activities
[2.] Is trying to get some backlinks.
Posting with the sole purpose of increasing your activity or to improve the search ranking for a website (paid service or not) counts as spam. There user is putting no effort whatsoever into the posts made and does not contribute to the discussion after that.
Let's not restrict the newbies too much. They already have many restrictions. It's better to report if something looks odd.
Making it a rule does not means users that violate it would be banned, it would just make a clear rule about it that someone reporting can use as a reference. The users would be corrected of their mistakes early and not down what to do and what not to do.