In the Wayland protocol development process, an authorized representative of a large project has the power to issue a NACK (negative acknowledgement) if they think that a protocol or its implementation is harmful to the Wayland project, which essentially kills that protocol, or at least its current implementation. GNOME has been very actively NACKing protocols that they don’t find useful (even if they would be for other compositors). It got to the point where the entire ACK/NACK process was restructured to prevent such abuse.