it's boiling the frog method. Moving too fast means backlash, but a slow, step by step transition where each step seems reasonable, but ultimately end up with a locked down device, is how they aim to achieve it. And people would be too lazy to complain until the last few steps, by which time it would be too late.
Your larger point still stands though of normalizing changing expectations by slow degrees
Google has just about got the pot boiling. They win, we lose.
No, it doesn't. It implies that the app for handling the deeplink lives within GMS as opposed to needing to manually install a separate app like you do on iOS. GMS does not have a hard dependency on device integrity APIs being supported.