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android - Why google Account login is required for GCM to work for devices below 4.0.4 OS?

Android developer documentation says :

It uses an existing connection for Google services. For pre-3.0 devices, this requires users to set up their Google account on their mobile devices. A Google account is not a requirement on devices running Android 4.0.4 or higher.

Why that account login is required . How google has removed that necessity for devices > 4.0.4 ?

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