Phantom Tantrum

When a person creates his or her own alternative version of a free of charge, viable, fully functional product or service in anger because of hatred towards the creator of the product or service.

Person 1: "I am really mad at that guy, I'm going to make an exact replica of his service just to annoy him! Haha, what a le epic troll I am!"

Person 2: "There's no need to have a Phantom Tantrum."