The user is not even directly involved in the discussion in the thread he creates. 34/35 posts created are threads and that's his way of attracting traffic to the blog site he refers to (probably his). I would say the report to moderator button still works fine right? So that's the solution now.

But in this case, I really want to know if someone who 100% posts a referral link on this forum as a real effort to increase the traffic of his site or personal blog is not breaking the rules? I may have forgotten something.