Mojang doesn’t want advertisements in Minecraft, at least not the ones they didn’t have a hand in creating. Mojang has added language to their commercial guidelines that forbids promotional material made by corporations, businesses, advertising agencies, non-profits, and governments within or associated with Minecraft. No more commercial Crystal Pepsi servers or Red Man tobacco mods allowed unless you’ve worked out a deal with Mojang.
We want to empower our community to make money from their creativity, but we’re not happy when the selling of an unrelated product becomes the purpose of a Minecraft mod or server.
The studio noted that individuals not receiving payment may still create fan-related Minecraft material with branded themes. If you’re just a nut about Adidas, and not affiliated in any way with the company, go right ahead and build that giant redstone sneaker.