Imo, the problem is that wpengine is a direct competitor to mullenberg’s own commercial exploitation of the open source stack WordPress. He also owns automattic, which offers WordPress hosting, just like wpengine. If you ask me, the owner of the open source stack shouldn’t also be able to dictate which other companies make money of it, when he does this himself with automattic, aka WordPress.com.

Then again I’m only involved through my profession. Privately I enjoy ghost.org.