Well I'm pretty sure he is
crazy or at least terribly immature.Lots of "I hate Selina and WR" stuff in the history of his user page. I'm sure Blissy could fill in the background. Lately he seems to have ran afoul of the wiki-cops. He would like to pack up his pics and hit the road.
I've tried to work through the merits of his arguments about "revoking" his grant of a GFDL for his contributions. He starts by saying a license
isn't a contract---which is correct. He then, however says "It is also established law that a license cannot be made irrevocable without consideration." I wish he'd cite some authority for this but he doesn't. Probably because he is either making things up as he goes along or is parroting arguments he doesn't understand. Consideration is a
contract concept--- not a license concept. He also seems to think that "consideration" is just money. He is ignoring that it can be a promise, such as promising to grant the license to subsequent users, or the promise to provide attribution. If consideration is needed to stop license revocation (something he has not provided authority for) he has been provided with ample consideration. Finally he is ignoring that other users are
relying on his prior grant,
to their detriment if he was allowed to revoke his grant of license, in respect to any further modification, developing and use of the content he provided.
So I'd say Malber is just some immature kid blowing smoke about something he doesn't understand. I also think if ever there is an appropriate reason to ban a contributor it is for asserting a content license inconsistent with that required by the site.