Sounds so weird I don't want to believe that.

So many other addons also alter game files, just makes no sense why that guy would be banned, it's not like he is doing such huge exploit. Blizz should just stop loading external files instead, like they did with m2 files and done. Sigh... -_-

We know it, many addons replace artwork too but it's okay because it's only client side visuals, the files that would give real advantage have been protected and won't be replaced without modifying the game executable, that is 100% detectable and will be banned.

Just replacing textures or files like sounds are not that big of a deal, it's a gray zone. They know because they allow these to load from the system in the first place.

On the other hand they can't put exceptions in their EULA/ToU so they say "all modifications are not allowed" but we don't really modify, we just put a folder in the game root that contains some files that the game loads by itself, we didn't force it to load them.

There is no option for removing the spell casting sounds, and keep the regular (all other sounds of bosses talking, combat, e.g.) so this way you can remove the frostbolt casting, heal casting, the sound when you spam a button while it is on global cooldown, e.g. There are no options to remove those.