For example, if the app handles personal data, like phone numbers of e-mail addresses, or device data (like EMEI numbers), developers will need to prompt the user, and incorporate a privacy policy in the app.
Furthermore, apps that collect data unrelated to the functionality of the app will need to inform users and gain consent prior to collection and transmission.
If developers don't comply within 60 days, Google said, it will warn users via Google Play Protect “or on webpages that lead to these apps”.Via: The Register
“Google Safe Browsing will show warnings on apps and on websites leading to apps that collect a user’s personal data without their consent”, the announcement said.