Actually, a country laws has to do with modding, because the server for TWC is located in the US and thus US laws apply for TWC to follow and the same thing also applies for hosted mods on TWC Download.
The only thing CA cannot take away from you are the resources
you have created from scratch for a mod. But CA can prevent your mod for being redistributed as CA owns every modification for their games.
That's pure nonsene as a gentleman's agreement doesn't exist among modders, instead it is the
GPL that covers that and the official EULA of course.
Yes there are legal aspects regarding modding.
Let say you have a created something from scratch, a modding resource if you will, and you have stated in your permission that nobody can use your resource without your explicit permission.
Now, let say somebody else are using your resource in a mod for personal use and later decide to release it then you can take action against the individual for copyright infringement in court if you wish.
I know Ponti is a lawyer, perhaps he can share his insights in this.