Because the machines tip everything out of balance, Earth becomes an unfit planet for humans and animals, so the remaining humans are put on Axiom (or Noah's Ark if you want to carry on the Biblical theme where Wall-E is basically Robot Jesus and his love interest is aptly named Eve) as a last-ditch effort to save the human race.
On Axiom, the humans have no purpose aside from having their needs met by the machines. The machines have made humans dependent on them for everything because that is how they were treated as "toys." It's all they know.
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The Pixar Theory
OverigThe Pixar Theory is an incredible theory found from Jon Negroni that has gained worldwide fame, and has even been featured on videos by popular YouTubers and famous talk shows. This is the incredible theory that every single Pixar movie is all conne...