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I would suggest to not support oh vey keys. Those assholes have army of bots that harvest all possible giveaways and then sell them for completing tasks xD
So yeah - If you tried to grab free game from hb (for example) and they run out of keys - OVK are one of responsible parties xD

Do you need to give them your phone number?
I remember trying GameKit, and immediately abandoning it because you have to give them your phone number if you want cash in points.
Because that's not suspicious at all. They don't even mention that in their FAQ.