I think they may have been turned off.
But whenever I watched the movie, I always wondered how he is the only one still going.
Did it ever confrom every one was turned of but that Wall-e?
They never stated it, but I think they were implying it on some scenes.
He defeintely was the last one. Ever since Andrew thought of the idea of WALL-E, and dug deeper into making it a movie, the whole idea was about a robot who was the last one on Earth. Even the German title is Wall-E The Last Robot on Earth. They never say it in the movie, but the idea has been there since the movies conception.
I think another possibility is they just wore out and didn’t change parts.
Maybe Wall-E (our Wall-E, anyway) was the only one that developed enough intelligence to know how to change all his own parts.
That’s a possibitlity^^.
Speaking of personality chips…
Maybe all of the WALL-Es have one, but disabled, and this WALL-E’s chip is enabled by accident.