Before I redid my backyard garden space, the bins were sitting right on the ground and, over the years, the edges had actually sunk into the ground 1-2". Now just the perimeter, or edges, of the bins are up on stone pavers but their interior space is still exposed directly to the ground underneath, so worms can move in an out as you suggest. The advantage to getting them up a couple inches is to allow the sun to hit the entire surface of the walls of the bins and to increase air circulation.
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Ohhhh right! That’s very good indeed. I didn’t realise the bottom was still open. Very cool