Probably because any ZSS player with 1/2 a brain cell once they figured out that up B sucked people down probably within an hour or 2 was all, ohh I bet I can hit something after this, and people who tried to claim namesake on it for discovering it first was just silly, and cake combo is the best name.
Ok, time for me to clear up this **** naming story for YET ANOTHER TIME. Everyone sit down and let Cake tell you a tale....
On August 25th, 2008, Somacruz2 posted a thread on the All is Brawl forums titled: "mastering the claw combo finisher." Here's a link if you want to read the entire thread:
http://allisbrawl.com/forum/topic.aspx?id=30687
The original post: "hey guys i was just looking to see how viable the claw combo finisher was. ( the one in is combo vid where he up b's his opponent into an up air, f air or b air) is this combo viable, cause i still can't seem to master this move? has anyone here pulled it off with relative success in a tournament match?"
Snakeee's post: "Claw combo??? Heh, well I'm pretty sure I did that first, but whatever XD"
DeliciousCake's post: "I'm pretty sure I did a "Claw Combo" the first time I played the game back in February. Might as well call it the "Cake Combo." Anyways, it's *barely* a combo, and by no means should it be named after someone."
The preceeding post was followed by posts such as:
Snakeee: "Heh, yeah it doesn't really matter. I like the name Cake Combo though"
JamesSparrow: "i'm calling it cake combo from now on."
"I did a cake combo this weekend and I threw my controller down mid match and screamed "CAKE COMBOOOOO" at the top of my lungs."
^^^^^
(This post is the origin of screaming CAKE COMBO after pulling off a Plasma Wire -> U-air finisher)
Amitwin: "Regardless of combo viability and stupid the naming thereof, i am forever doomed to asscociate this "combo" with cake whenever i see it.
God ****it."
myRoboticClaw: "Cake combo is win. :D"
^^^^^^
(From the man who could have easily promoted it being named after himself)
TheRealBobMan: "So anytime I chain an aerial out of upB (is this including Dair or Nair, or does it have to be Uair/Fair/Bair?) I shout out, "CAKE COMBO!"?
I think I'll start doing this. Lol."
Rpg: "Yeah cake combo is good. =D"
noradseven (hey I recognize that name): "cake combo is cooler name I agree, but this is like what 2 hits thats no combo. It resembles a loop more because it can resets the opponent to where they were at the start."
Hayato: "BTW Cake Combo definately sounds more sexy its almost like "The Hayato" in Melee... except it cant be done nemore"
Jigglyzelda003: "cake combo is catchy lol. i like it."
Mooderpie: "i suggest yelling i want cake after one everytime"
^^^^^^
(JamesSparrow was on this first bud...)
ThreeSided: "Awesome. Cake combo it is.
I'm going to yell it... and no one will have any idea what the hell I'm talking about."
And that, my friends, is how the Cake Combo came to be.
EDIT: I think we need a sticky on this post just so we don't have to go through this again.