Hmm, maybe not even open for OEMs...

Skyhook sues Google for business interference. PDF link of the court filing. Basically boils down to Skyhook negotiating with Motorola and "Company X" to use Skyhook in their Android products. Google interfered by issuing stop ships orders claiming the devices were no longer "Android compatible", and in the case of Company X, this was after products had previously been certified and were already out on the market.
Originally Posted By: Skyhook court filing
Though Google claims the Android OS is open source, by requiring OEMs to use Google Location Service, an application that is inextricably bundled with the OS level framework, Google is effectively creating a closed system with respect to location positioning. Google’s manipulation suggests that the true purpose of Android is, or has become, to ensure that “no industry player can restrict or control the innovations of any other”, unless it is Google.