does not restrict voting by WordPress logged in user

I puchased the developer version of this plugin, only to realise that users can vote more than once by either switching devices (bypassing cookie) or by changing internet connection (bypassing ipaddress).

Even the free version of YOP poll is able to restrict by wordpress logged in user. That is a much better way of doing it.

Very disappointed to hand over money and be left with what is essentially a useless plugin!