It isn't just about morality, but that's one aspect. It's also not legal for it to have been done the way they did it. NONE of the mod authors were consulted, so no legal permission had been given.
This is where I think you and I differ in terms of how we view copyright. I don't view it in a way where when someone breaks it, it's instantly just horrible or like "off with their head" kind of thing lol. Plus, each copyright holder kind of gets to make their own choice in how much they want to uphold their copyright. This is why in so many cases where copyright is broken (technically even drawing fanart is breaking copyright), it doesn't mean the one who broke it gets in trouble. Circumstances matter. And this is also why when one does think it was bad enough, they go to court and then a court decides on the outcome.
I have had people redistribute my work without permission at times, and you know what. I don't bite off their heads for it because in most cases, their intentions are not bad. And unlike you I consider intentions and circumstances because it matters. However, there is a circumstance where I do care. Like when my work from patreon was redistributed because that requires doing it for nefarious reasons. They literally have to become a patron to then leak the work I do.
The fact you don't understand the difference is mind blowing.