The requirement to publish a developers contact info is part of the EU Digital Service Act (Articles 30:Traceability of traders & 31:Compliance by design for online platforms).
If your app generates revenue in any way, you are a "trader" in EU lingo. If you could add an update to your app later that generates revenue in any way, you could become a "trader". "Traders" are required to publish: (Full business or individual name / legal representative info, A physical mailing address (or P.O. Box for individuals), A verified telephone number, A verified email address).
Google is required (as a "platform" under EU DSA ) to ensure that this information is publicly available to all EU users of apps on Android. They required everyone who wants to publish an Android app to register with Google. Compliance achieved.