It literally only does this if you very explicitly tell it to. They're mad because their computer did exactly what they told it to. This is a simple case of use

It literally only does this if you very explicitly tell it to. They're mad because their computer did exactly what they told it to. This is a simple case of user error, followed by a user lashing out over their own mistakes. It's like being mad at Linux for letting you 'rm -rf ~/Music' it simply did exactly what you told it to. I use iTunes Match across a myriad of devices and it is a wonderful service. It's sad to see a frustrated end user spreading such FUD.