Because if you're doing an optical illusion from an animated GIF you'll have to show that its down to a real optical illusion and not futzing around with images within the animated GIF itself.
Surely the same is true of any form of computer-animated optical illusion. At least with a GIF the tools to decompose it into its constituent frames are relatively easily understood; you could not say the same of disassembling a java applet to determine what it did.
Show me an animated .gif that can cause the dots to go green if and only if I'm staring at a certain point on the screen that doesn't rely on optical illusions and I'll be very impressed indeed.
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