Like almost everyone knows, they only joined the redress scheme to protect their "charity" status. It's all about money, just like everything else the Borg does.
Even though they joined, and tooted their own horn for doing so, you can bet they'll fight tooth and nail over every single claim. They will almost certainly coerce, badger, and even threaten the victims to get them to give up their claim or accept a far less amount than they were entitled to. "Why would you want to take away dedicated funds that could do so much good? You are robbing Jehovah!"