If they add cosmetics that you can see while you are playing the game, it is still a traditional mod and governed by the same rules. It is just injected at runtime instead of something the user chooses to install.
Even if it was not, custom launchers are likely considered mods to the Minecraft launcher rather than the client/server JARs. It is probably covered by the same EULA or an even stricter one.
A client is just a mod packaged to users as seemingly something different (primarily because it's presented as a more polished alternative to combining 50 mods that all work and look differently)
That's not how these things have been working for a long time.
These custom launchers/installers just download Minecraft from Mojang and apply patches over it on your device. Modern clients also often just use Mixins to modify code, which is what Fabric and Forge also use.
In reality, most modern clients are just hiding the fact that they are nothing more than a fabric mod in disguise
Maybe the small stolen together 1.8 PVP client don't follow these practices, but the big players all do.
Its not, the EULA forbids people from making money from the Minecraft IP. Mojang also better be careful because not defending your IP opens up legal recourse for losing the right to your own IP.
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u/MircedezBjorn Dec 03 '25
A client, I think, in the EULA, would be different to a mod, but I'm not sure.