RL is a rigged game
It works something like this:
Your character is chosen for you at birth. If you are born into a family of Pichus, for example, you are also likely to be a Pichu. It is possible to succeed, it's just that the odds are way against you.
Likewise, if you are born into a family of foxes, you're likely to also be a fox.
Unfortunately in RL there seem to be a lot more low and mid tier mains than in melee. 1% of the people in the world play fox. There are also a fairly large number of people that play king dedede in dream land, they have no chance of winning cause they're not even allowed to play.