Why are vb.org's mods getting ripped/redistributed?

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There isn't anything anyone can do about it that already isn't in place at vB.org. I believe that vBulletin.org takes every measure they can to not allow people to freely download these modifications. However all it takes is 1 person with 1 valid license, and the modification is distributed to the entire internet.

Generally sending DMCA notice won't work, they're probably hosted some where that will make no difference. Your best bet is to just keep on contributing to the community and forget about the scumbags that are doing this, as they've been doing it for a while, and won't stop for a while either.

Even modifications that aren't released here such as paid or commercial modifications appear on most these sites, so its a entire WWW problem and not just a vB.org problem.