Considering that Pong is one of the simplest games that anyone can work on, the question arises why would anyone even want to make Pong. Even though the gameplay elements of Pong are simple, the underlying engine needs to have everything that a modern game has.
Mutliplayer - P2p and/or Server Client and or shared input
I had come across this article a while earlier. Its an interesting read and probably a reality check for people getting into games.