You might have already seen my reply to the other issue, but that one was closed so I wasn't sure if you would see it, so here is a copy paste of my reply/question.

I respect your decision but I'm just trying to understand it: your mod 3D skin layers (which I love btw and have been using for a long time) is under MIT license, and I don't know much about it but doesn't it allow commercial use?

This is from the official website (https://tlo.mit.edu/understand-ip/exploring-mit-open-source-license-comprehensive-guide#:~:text=The%20MIT%20License%20is%20known,growth%20of%20open%20source%20software.):

"The MIT License is known for its brevity and clarity. It grants permission to use, modify, and distribute the software, with the condition that the original copyright notice and the license text are retained in the redistributed software. This ensures proper attribution to the original authors while offering maximum freedom for developers."

I looked through lunar client application's file on my computer and there are licenses pointing back to the original mod in the ".lunarclient -> licenses -> 3dSkinLayers.md" If you believed that they didn't implement the mod into their client according to the license, did you try and contact them to notify them of that? That's what happened with replay mod and lunar had to take it down and reimplement it according to license and the creator was fine with lunar (see below).

Furthermore, replay mod as you mentioned is also listed in ".lunarclient -> licenses" and is under GNU GENERAL PUBLIC LICENSE (you can find the full thing in the licenses section of the mod at https://modrinth.com/mod/replaymod under
"Details -> Licensed under GPL-3.0-or-later"

Lunar even had to temporarily take down replay mod because they implemented it in a flawed manner, and after being notified by the creator of replay mod they took it down and reimplemented it according to the license, you can find the article here: https://www.lunarclient.com/news/replay-mod-is-back

I'm not trying to be accusing or anything I'm just trying to understand since I'm no expert on like these copyright things.

See comment on the other issue.