[johnnyfaehell]

To be able to detect robots. Makes sense since most users will move their mouse in a massively different way than default robots. There is also probably some product reason like being able to see if people had their mouse around an ad before clicking it, etc.

[palerdot]

If robots can mimic human conversations, this should also be trivial. This not only looks like a lame excuse, but also massively underestimates the ability of automatons that mimic humans.