According to MR.Happy :

Most of the big warez sites don't allow you to submit the same links through multiple sites. On MechoDDL and NexusDDL they'll get blocked or removed like what used to happen on Katz. Don't think LinkPlz has that feature yet but all it takes is for the owner of a DDL site to see this topic and they'll take action/reduce rank etc.

You've being warned