Although never stated explicitly in the film, the concept for Earth's purging process was that after the 5 year run of the robot program, all the trash would be in a compact form. Then they would proceed to the second phase and burn the garbage. They never got round to it because the trash was simply too much. That's why WALL E was still doing the same job 700 years later. Basically the rest of the robots were switched off and WALL E was coincidentally left unchecked. Through years of experience he gained sentience and learned how to repair himself with the spare parts he gathered.

Film

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