What do you think ??
It's an important attitude to be taken. Stealing is the worst crime and must be punished. The community has to be supportive of it's members, and be very severe against hackers and scammers.
So, maybe someone from development team would manage this wallet on which donations for bounty can be made. I suggest development team coz , people would like to have some level certainty that these founds will not be defrauded.
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best way to do it is for the person who lost the BTC to offer say 20% of the returned BTC as a bounty seen it happen on another hack recently and the thief got in contact.