Google has partly reacted to the presence of cloned Siri apps on Android by pulling one of the titles. The "Siri for Android" app has been quietly pulled from Android Market about a day after it was first discovered. The developer, operating under the deliberately misleading company name Official App, has also had its only other app, a fake Pinterest app that only linked to the website, pulled from the store.
The takedown likely didn't need any requests from Apple, since violating intellectual property and copyrights themselves are likely grounds for removal, as is the attempt to deceive downloaders.
Despite the move, the more directly imitative Speerit (Android Market) is still available. Although it has its own engine, unlike Siri for Android's rehashing of Google's Voice Actions, Speerit's entire interface is intended to copy Apple's and takes several icons directly from iOS.
The one withdrawal follows a historical pattern for Google of taking a reactive approach to apps, removing them after publicity or complaints. While it hasn't slowed Android's growth, it has meant damage as scam apps and malware have had a chance in the past to affect real users before they were pulled.