Google has updated its Play Store rules to impose a "formal" ban on stalkerware apps.
Stalkerware is a code that transmits personal information off the device without adequate notice or consent and doesn't display a persistent notification that this is happening. These apps typically transmit data to a party other than the PHA provider. According to Google, acceptable forms of these apps can be used by parents to track their children, however, "these apps cannot be used to track a person (a spouse, for example) without their knowledge or permission unless a persistent notification is displayed while the data is being transmitted."