Your comment reads like you don’t understand either 1. the intention of the GPL (copyleft), 2. how it’s supposed to work (requiring derivative works to also be

Your comment reads like you don’t understand either 1. the intention of the GPL (copyleft), 2. how it’s supposed to work (requiring derivative works to also be GPL), or 3. you don't think it’s legally enforceable (it is). Whether or not the GPL is a ‘good thing’, the scenario in question is pretty cut and dry. The problem itsn’t “people like Matt Mullenweg”, it’s people and organizations who don’t RTFM on the licenses of the code they decide to co-opt into their mainline product. It looks an awful lot like Wix is afoul of the GPL, and therefore has probably committed copyright infringement.