It's a commentary on consumption, via one lonely little robot.
Human dystopia
This year, reality collapsed into pixels - Vox
Looking back at what WALL-E says about how we live - Marketplace
Pixar's 'WALL-E' Dystopian Predictions Came True - Bloomberg
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WALL-E's 15th Anniversary: What the Disney Pixar Movie Got Right
Pixar's 'WALL-E' Dystopian Predictions Came True - Bloomberg
Why We'll Never Live in Space
Ten years later, what we learned from WALL-E - Marketplace