If it were concentrated to one small hole, it would. The same way putting your thumb over the end of a water hose will make the water spray farther. The wide base around the bottom of the sphere gives enough space for the water to come out without squirting far.

Here's one that does squirt out more than most: https://youtu.be/yEeEU-WRbP0

Maybe they have the water pressure too high, maybe the tolerances are too low, the sphere doesn't fit the cup quite right, so they need higher pressure for it to spin. Considering the shape of the base, I think they designed it this way, though. I like the water splashing out of the bottom, that makes it more interesting.