They said they're not satisfied with its security, but what they meant was that they're not satisfied with its profit margins. Their greatest wish is to lock it down as tight as the iPhone so that they get a cut of every transaction that takes place on your computer.Actually, they kinda did. Apple did express how they are not satisfied with the security of macOS (thus they are slowly putting more restrictions on macOS). If you use a current macOS now and the old OS X, you will find the experience of installing 3rd party apps to be quite different, with current macOS putting out a slew of warnings and blocking installs.