You arent concerned that your opinion is contrary to the Berne Convention?
Despite the first sentence of the OP I cannot see how these rules encourage or benefit modders. No amount of marketing spin, doublespeak or PI fan sychophancy can conceal that these rules overwhelmingly limit modders. To PI’s credit in the past they have sold an open and easily accessible game engine which was very modder friendly. However I find their recent attitude and the rules restricting modders in the OP concerning, the main examples being:
-Protecting the DLC cashcow meant that it was not in PI’s best interests to continue to allow army sprites or map items to be moddable.
-Mods must be PI forum or Steam Workshop only
-Mod authors cannot claim any IP protection
Moreover these rules are not even been enforced in a consistent manner. Why have these onerous rules then not enforce for example Rule 6)?
It seems contradictory that although mods cannot claim any kind of license or copyright PI will delete a mod if it contains elements from another mod. As has happened in a few recent cases this fosters petty possessivness and a community that turns on itself and destroys mods rather than working together (e.g. permission granted then retracted, permission refused).
Places like the Nexus or even Total War forums have large and very successful modding communities and despite some quirky rules are no where near as draconian as PI’s.
Its understandable that Paradox what to cover themselves and protect their IPs but these modder unfriendly rules will end up driving modders away. Personally, along with many others I wont release anything here. PI's Rule 4) is also going to strongly discourage professional or semi-professional artists/coders releasing their mods. For example I cant see the excellent artist Danevang who was hired by PI to do the CK2 vanilla portraits
http://forum.paradoxplaza.com/forum/showthread.php?689357-Danevang-s-Saecula-Nova&highlight=Danevang being inspired to complete the unbelivebly brilliant work he had started under such conditions.
There is little enough incentive for modders but when a modder has no rights to anything they create (except against other modders) as PI illegally asserts its a cause for concern.
The games and players will suffer for the lack of good mods.