If that were to happen, someone could fork the site using the last CC-licensed data dump. I would hope that would happen immediately upon any change in licensi

If that were to happen, someone could fork the site using the last CC-licensed data dump. I would hope that would happen immediately upon any change in licensing away from CC/GPL/GFDL/similar. It's not impossible but they can't just make off with the data in the way that CDDB did. (Now, if you want to talk about a company abusing the community ... look at Yelp.)