The Android 12 beta is “by far our most downloaded/installed beta ever”, says Dave Burke, the VP of Engineering for Android. Unfortunately, he doesn’t give any concrete numbers so we can compare with previous betas.
Android 12 first entered the beta testing phase in May and it brought the first major redesign to the interface in a long time. This new iteration is called “Material You”. That surely helped spark interest in the new version.
The Android 12 release timeline
Also, several makers had Beta 1 ready to go sooner than usual, so it wasn’t just Pixel owners downloading it. Speaking of, yesterday Google started rolling out Android 12 Beta 2 for Pixel devices with new privacy features and other changes (i.e. a questionable change to how the Wi-Fi quick toggle works).