My above post was deleted from moderators I think.
No. You are incorrect. It states very clearly that the post "
was deleted by the starter of a self-moderated topic".
You chose to post in a self-moderated topic. The person that creates a self-moderated topic can delete any posts that they don't want in their thread. If you don't like this, then don't post in self-moderated topics.
I would like to know what is wrong in it.
There doesn't need to be anything wrong with it. If the person that created the thread doesn't want your post in their thread, then they can delete it. That's what "self-moderated" means.
It looks like even moderators are supporting for scam activities.
No. It just looks like you don't understand how to use the forum.