Regarding (1): Of course a step is possible; you never know. But for arithmetic, it is not a step. That may appear so from their poor Figure, but the data indicates otherwise.
True. Do these tests scale out to super-human performance or are they capped at 100%?
Except if you have an idea to monetarize one of these sub-tasks? An invest of order 10m USD in compute is not very large if you can create a Pokemon Comedy TV channel out of it, or something like that.