Though I cannot give an official statement, Microsoft has a long history of abandoning open-source projects once the employees working on them get bored, switch jobs, or move to other roles. It also doesn't help that the iOS Bridge wasn't used that much, didn't bolster UWP adoption (we all know how that went - developers were completely apathetic at best), and never supported Swift IIRC, only Objective-C applications. With more applications using Swift in part or even fully, and UWP being dead, and Windows 11 supporting Android apps on the Amazon App Store, the bridge is dead without major investments which Microsoft appears to have no interest in pursuing.