They do actually give away money - although with some strings attached (like your government not using open source!)
IKEA itself - not the owner - is a charity, registered in Holland to be in the Eu but actually in the Dutch antilles so they don't pay Dutch tax and they can keep secret any donations
Do you have a reference to back up the OSS prohibition? It sounds like an urban legend and I couldn't find anything searching, but I've seen weirder things before.