Why Are There No Competitive Arena Fighters?

Arena fighters are a popular game genre when it comes to party fighting games. The real question we're here for today, however, is why have none of these games ever been competitive?
Discord links to the scenes mentioned:
Shrek SuperSlam - / discord
Tom and Jerry in War of the Whiskers - / discord
Godzilla: Destroy All Monsters Melee - / discord
Power Stone - / discord
One Piece: Grand Adventure - / discord
A fair warning, most of these scenes are quite dead and most of the activity you'll find is in the Shrek Discord.
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