Luis leon has 12 posts (topic/thread in fact) which include article link of coin*****.com, I believe there's nothing wrong to share such a site (Am I wrong with this?).
You can report a single post or thread if it is low value. Moderators will handle your report and mostly those posts or topics have low value.
But all the other sites promote themselves in a single thread; they create an announcement & update every time they have something to share with the community but Luis leon is creating a thread every time he needs to share one of his articles. Is it okay to create a thread every time they create an article on their website? Or, they should have an ANN thread here & update on that thread?
It is not ok. You answered your question. If they want to promote their website officially, they must create a ANN thread, and do their business with it.
The fact is, I don't think they don't know about it. What they do are:
- Ignore rules
- Create as many threads in as many boards as possible to make as much exposure as possible to forum members.
You can report their threads if you want.