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Surely any contact can be rivised, or dropped. Or is this wishful thinking :o)
However - if someone was to type in "directory" in a search engine than those clones should't show because they're duplicate content.
But as far as link voting is concerned, they're ligitimate votes. (Most DMOZ clones don't have high PR's anyway.)
A one-way link from a DMOZ clone is much more ligitimate than a link on someones links page where they're link swapping just for the purpose or adding PR.
If Netscape could legally, they wouldn't want to do so politically. Some ODP editors, including former ones, would complain that Netscape is now using their former volunteer labor to profit. AOL/Time Warner wouldn't want the bad will this would generate.
Removing competing sites from categories I was interested in to boost my own sites.
Adding spam sites that wouldn't normally get into DMOZ into categories.
Giving my sites multiple listings in all appropriate categories.
Creating numerous clones on different IP addresses to further boost the above benefits.
Any more needed?
From the above I would suggest that it would be good policy to remove DMOZ clones from the Pagerank calculation.