This is kinda what I thought they were after, not any other concerns.
Under the guise of protecting trademark, it looks exactly like they're seeking to close down unrelated fan sites with established communities. Basically, they let others do the groundwork for them --- all the trial and error, at first making no money at a hobby, and then building a relationship with a community. No corporation wants to do any of that.
Now they want to simply step in and take over what other people built, not "in their name" but "as their fans" and as a separate entity. The Martins, who run Ikeafans, never had any form of written contract from Ikea promising eventual compensation if the attempted site was a success and taken over. Instead, with no contract, Ikea still knew they were benefitting from the existence of the site -- and got several employees to become members on it. So they were learning how to do it all along - for free, with no risk, and then they copied the model.
Now they know how, and they want to kill their competition.
I think they're trying this because online merchandisers have a major problem with brand loyalty. That's partially why the whole Facebook depression test happened. They wanted to know if they could change people's emotions because it's so hard to predict how people will buy online.
If a company could just steal a community full of faithful fans, then they wouldn't have to worry about brand loyalty anymore. All they'd have to do is directed market research, and targeted advertising. Doesn't that make their job a lot easier?