They are still selling DLC separately the old-fashioned way, mind. Given that the base game is free these days, yeah, not a huge surprise. Alternatively, you now have the option to pay £4 a month to get access to all the dynasty-building RPG's DLC, thanks to a new subscription service Paradox launched yesterday. If you wanted all the expansions and content packs for Crusader Kings 2, at MSRP you'd be paying over £200.
