Google has always controlled which devices ship with its proprietary GApps—a package that includes such necessities as the Play Store and Google Play Services. Until now, they've even been pretty lenient about allowing custom ROM users to flash the necessary payload on top of their modified OS. Unfortunately, some OEMs used that loophole to their advantage, ignoring Google's CTS certification process while shipping devices with GApps or shamelessly encouraging users to sideload them.

According to XDA Developers, that loophole has now been closed. Google Play Services will soon check the build date for a given system image, and if that date is after March 16th, it will be blocked from completing the sign-in process—though custom ROM users can manually register their devices for an exemption. 

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