The Android KitKat (KK) platform was first released ~10 years ago and since then, we’ve introduced many innovative improvements and features for Android, which are unavailable on KK.
As of July 2023, the active device count on KK is below 1% as more and more users update to the latest Android versions.
Therefore, we are no longer supporting KK in future releases of Google Play services. KK devices will not receive versions of the Play Services APK beyond 23.30.99.
Google Play services discontinuing updates for KitKat (API levels 19 & 20) starting August 2023
We are no longer supporting KK in future releases of Google Play services, and KK devices will not receive updated versions of the Play Services APK.
android-developers.googleblog.com