IANAL, but isn't it incumbent upon IKEA to issue a C&D, whether they want to or not, in order to show they are actively using their trademark?
From what I've heard, if they didn't, someone else might have a case that their trademark is open to use.
From what I've heard, if they didn't, someone else might have a case that their trademark is open to use.
http://abovethelaw.com/2012/07/cease-and-desist-letter-of-th...
Another way to deal with unauthorized use of a trademark is to authorize it. So IKEA could have started with a letter asking IKEA Hackers suggesting a potential agreement and a nominal fee. An imperative cease and desist letter isn't required.
> If they didn't, someone else might have a case
They could have just licensed their trademark to the website for a non-null sum of money.