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Multiple reasons.
What did most(with a few exceptions) of the Cartoon Cartoons have in common? One, they started off as shorts, and kids voted on whichever one they liked best to become a full series. Two, the Cartoon cartoons started off as being animated by Hanna-Barbera, then they transferred over to digital animation when H-B was deprecated. They had similar animation styles (again with the exception of EEnE): flat, angular, 60s-esque stuff.
Codename Kids next door was the last show to premiere under the Cartoon Cartoon brand, since that was CN's last original show to be greenlit based on voting results from kids, and the last one made with some H-B involvement (they did the pilot episode). Shows like Camp Lazlo, Hi Hi Puffy amiyumi, and Class of 3000 had no business being under the Cartoon Cartoon name since those were simply CN original series made from scratch with no Hanna-Barbera connection, and the animation styles had changed.
