I see a lot of comments joking about rats driving Tesla's and maybe Uber could use them, obviously not but are there any real world application where this could

I see a lot of comments joking about rats driving Tesla's and maybe Uber could use them, obviously not but are there any real world application where this could possible be useful? The one I came up with was rats in a crop driving little solar powered 4x4 machines around pulling out weeds. Any other thoughts on how these could realistically be used?