They will find it very hard to get round this. They would have to either exploit some weakness in the system (which once reasonably mature would be nigh-on impossible), or devlop a machine that could tell the difference between the animals (completely impossible at present, I'd guess). Or brute force it, but you code against that.
Sadly though, the one way round it that is likely to be used is to pay people in poor countries a pittance to sit there all day and click kittens.
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