Yes, they have an App Store on MacOSX but it's totally optional
It pretty much HAS to be installed, and you pretty much have to use it for OS updates.
And with each successive release OSX tightens the screws a little more, in the name of security...
You can't run apps you didn't get from the app store on a new mac until you go into security settings and turn on the ability to use apps you didn't get from the app store.
So its totally optional, in the sense that it comes pre-installed, you can't remove it, you have to use it for some things, and out of the box it is only option you are allowed to use to get new apps.
But yes, you can tweak the security settings to allow you to get software from other sources.
So...its like secureboot...which everyone here likes and thinks is ok... right?