I don't even know where to begin listing how bad of an idea this is.
I'll edit this comment to add onto it.
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Okay. so why would this help, exactly?
It'll make the games a witch hunt for people with ranks, it'll boost the amount of false reports at least 20x if people were to know about this.
Now, imagine someone with an iron rank (like myself), running into plenty of donors hacking?
I'd feel pretty scammed because "FREE RANKS!"
You can donate for the obsidian rank on another account, get a friend to record you hacking, then he has iron rank. This could work out pretty well when you're an inactive obsidian rank.
Seriously though, why should this be a thing? For people that can't get a rank?
They can just enter the twitter giveaways that Cube does every now and then.
And also, this wouldn't just increase the amount of false reports, but it'll increase the amount of fake reports too, as it's not too hard to fake evidence if you know how to do it.