To give you some examples:
-People in China who live in a big many-family-one-house
-Students at university
-People at work
-Internet cafés
-Hostels, dormitories.
As you see it's not so hard to find you people that match the same IP while registering and in that precise moment, and maybe just one of them is a spammer, not everybody is so luck to have a private internet connection at home.
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