But it's not the hop itself then that is generating the speed; it's the corresponding push with the toe pick.
Not all hops use the toepick. It also depends on how much sideways force the hop is using.
As Doris said, "The force you exert parallel to the ice increases your forward speed."
If someone is hopping mostly straight up without much of a push sideways into the ice then, yeah, that isn't a "cheat" to help increase their speed instead of using edges. By the same token, though, you can hop across the ice rather quickly by pushing into it on each hop.
The hops that Davis/White use going into their twizzles don't have a forceful toepick assist to generate speed. They do, however, have a lot of hops in the program where the toepick is pushing the ice.