SafetyNet is a set of APIs from Google Play Services for developers to ensure that apps are running in a safe environment. It is optional for app developers, and app developers can choose to use it or not. SafetyNet prevents an app from working if an app’s developer doesn’t want it to work on devices which are rooted, tampered, running custom ROM, or infected with malware.
Banking apps, Snapchat and Netflix are examples that uses something called SafetyNet to detect whether your device is rooted or not, and blocks access to those features.
For those apps which are using SafetyNet:
In June 2022, Google announced that we should start integrating with the Play Integrity API as soon as possible. The Play Integrity API includes all the integrity signals that SafetyNet Attestation offers and more. SafetyNet Attestation will continue to work for your app as of now.
At the end of June 2023, developers that have migrated to the new API will be able to continue using the old SafetyNet Attestation on older versions of their apps, but those that have not migrated will not be able to do so.
At the end of June 2024, Google says SafetyNet Attestation will be retired entirely.