hmmm...
Who cares if they made their own damn forum software.
Sorry to be so harsh, but there's literally hundreds of forum applications already written, why waste precious weeks of ones life rewriting what has already been done by someone else?
Really though.
As much as I try to create my own code as much as possible (and I have libraries of my own code), I will use what is already in existence if it suits the needs of the application and means that I can get the project done and over with sooner rather than later.