What Coreutils-adjacent GPL enforcement there has been centred around Busybox, a GPLed implementation of many POSIX and Unixish tools, commonly used in embedded devices. Busybox-related enforcement has been an effective tool in obtaining compliance, to the extent that it's been reimplemented under a permissive licence with the explicit goal of reducing enforcement risk. Coreutils has simply never been subject to enforcement in the same way, so there's no significant impact.