You make a good point. There are many situations in which it's fairly obvious how the comparison ought to be made: the human should not be allowed to use a horse in competing with the horse in "running", and should not be allowed to use a computer in competing with the computer in "guessing sexuality". However, if the competition is in "predicting share price movements" then surely it would be strange not to allow some kind of computational assistance for the human, so in those cases, at least, it gets a bit hard to decide where to draw the line.

A bit unrelated but there are horse vs people marathons. and many times people win. that is because horses cannot cool themselves like people can

Yes, see "persistence hunting". It turns out that although humans may be thrashed by a poodle over short distances they are really rather good at extreme-long-distance races.