Practically, the components of Android which mandate a user account are not distributed so that the user can modify them. The exemption does not apply.
But if Ubuntu bundles an Nvidia graphics driver that is not open source does that disqualify it? It's normal for there to be a mix of both open and closed source code in an os.
A better example is: I install Debian and later, somehow, the Google Play Store. Maybe that’s the only way to get some driver. Who is responsible for asking my age: Debian or Google?