I thought I'd notify you developers about this problem with free plat offers. I'm actually not sure if it's under your control though, since the offers are controlled by NativeX and TrialPay. And I guess you may already be aware of this issue.
I have been able to complete the same offers on two different devices. Each of my devices shows a NativeX offer menu independent of the other. The offers seem to be tied to the devices and not to accounts. It would seem to be best to tie it to both accounts and devices so people can't spam plat on several different accounts (which they can't as far as I know) or several devices. I think this is a huge problem since a lot of people nowadays have a smartphone, computer, and tablet, as well as other STG compatible devices.
NOTE: I'm not sure about it being this way with TrialPay, since their offers almost never work for me anyways, but it DOES work on NativeX.
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