No one is doing any wrong by using something you put on the internet, when you give them such access.
If they are claiming ownership, and authorship of such things, I agree they should be reported.
But not if they just use those so called exclusives, because I know every eAthena server that uses customs uses some from someone else on eAthena.ws or the late RUNE.
The point of exclusiveness is to restrict access to the point where no one can gain access to some area without your permission.
Meaning, you have to safeguard whatever area that is. If that's a GRF, don't even bother, unless you encrypt the grf, and set the client to read that kind of encryption.
Honestly, it's common sense, once you release something on the internet, it's out there for good. You no longer have control of it.
If you don't like that, then don't release things on the internet.
And so, I suggest that all threads that are about someone using files without permission be locked and/or deleted from this point forth.
As we have seen in the past few days, all that comes from these threads is flaming, and flaming isn't friendly.
And an unfriendly RMS isn't going to attract members.