I'm just reading through the licence again. When you buy the game on GoG.com, I think it's already patched to v11, so it already includes mods added by the community. So would I be right in saying that GoG.com would be in breach of this line in the licence?

Quote
3.1.4 not (and not to allow any third party) to profit or make any charge for the Source Code, or Executable Code, any Exploitation of the Source Code or Executable Code, or for any Derivative Works;


In which case, as I would think GoG.com would have checked this, maybe they know that the licence is void?