Because licensed cartoon games are mostly meant to be quick tie-ins instead of anything with actual quality or substance.
I think a Foster's game could be good as a Super Mario 64-esque platformer. Remember how Mario jumped into paintings, transporting himself from Princess Peach's mostly quiet castle and into many wild, dangerous, adventure-filled worlds? Maybe the Foster's game could have Mac and Bloo jumping into paintings and transporting themselves into different fantastical worlds, each taking famous elements and minor/one-shot characters of the series.
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