Being a competitor to me is being able to show off all the things you've learned, or even to learn new things from people who are at the same level of skill or higher than where you are.
The FGC is a place where anyone and everyone has a place or clique to go to. No matter how obscure or well-known a game is, it's a place where you can find like minded people to talk and interact with over your favorite or their favorite game. It's amazing honestly.
The events that FCE does with FighterZ are great. It's a great way to improve or just have fun. It's always a pleasure being able to participate in them when time enables me to!