May I ask who did this?
You can also send me a PM, if you don't want to reply here. 

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Yes, it's difficult to prove. But we can watch these account and when they try to enroll in a campaign, we can try to connect their wallets due to Blockchain analysis and give out appropriate trust, if there's abuse ongoing like joining the same campaign with multiple accounts. 

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I'm getting bombarded with translation requests today, really doesn't look legitimate and therefore I've locked all my topics for now to ensure all translations are good quality.
I'll set up a topic like discussed above in Meta or in Reputation, where everyone can give his 2 cents about a translation and only in case several DT members from each local board in question will approve it, I'll give out a reward and add these approved translations to my list.
Low quality will be rejected.
Massive and / or repeated abuse due to low quality translations might lead to a trust entry.

I'll link my topic here, when I'm ready but could take a while, probably early next week.