GOOGLE WILL BLOCK SIDELOADING OF UNVERIFIED ANDROID APPS STARTING NEXT YEAR

Summary from the TLDR newsletter

Google has announced plans to begin verifying the identities of all Android app developers, no matter where they offer their content. Apps without verification will stop working on most Android devices in the coming years. The company plans to create a streamlined Android Developer Console that devs can use if they plan to distribute apps outside of the Play Store. Google won't check the content or functionality of apps outside of the Play Store.