Of course I don't believe that it'll work 100% of time time, since nothing will.
Fighting against cheating in online games is going to be a constant arms race.
That's not to say that detecting most of the naive implementations isn't worthy of the effort.
It won't always work consistently but it should be pretty obvious when someone is lerping between two quaternions. Then, you can build upon that and attempt to detect small bits of random noise that'd be applied upon said interpolation and go from there.
Fighting against cheating in online games is going to be a constant arms race.
That's not to say that detecting most of the naive implementations isn't worthy of the effort.
It won't always work consistently but it should be pretty obvious when someone is lerping between two quaternions. Then, you can build upon that and attempt to detect small bits of random noise that'd be applied upon said interpolation and go from there.