There is a HUGE difference between free DLC in Civ4 (WW1 mod, etc) and fighting against the corporate machine grubbing for money. I knew there'd be DLC, but under the same model as Civ4, either free (like WW1 mod) or included in patches/expansions (like Civ4).
The expansion model is a completely different thing. XP's gave modders extremely clear, very defined lines in the sand of what could be crossed. Every modder knew they could use a vanilla leader in a BtS mod, but couldn't transfer Great People to vanilla. It was made even simpler as all Warlords content except scenarios was also released with BtS. 2K have set a new precedent for Civ, in that their intentions to turn Civ into a continuous revenue stream have been exposed by charging an extra $10 for Babylon, and enticing expensive pre-orders via the map pack. We have entered the Sims model of DLC.
If someone release a Mesopotamia map, how "similar" to the paid DLC must it be to be classed as "infringing copyright" and removed? That is an extremely grey area. Similarly, if I make WW2 with Stalin, and then 2K release Stalin as paid DLC, am I then in that grey zone and risk removal?
I've seen in other games, mods released to the public and then removed later when that company released paid DLC that overlapped with that mod. 2K will do whatever it can to protect its revenue streams.
I'm a fan of a game, totally unpaid for whatever I do for that game. Why should I run the risk of entering that grey zone and then have 2K lawyers knocking on my door? I'd rather not bother thanks. It's just a game.