The changelog released today for Play Store 44.1 says this “Share apps feature on Google Play will be retiring.”

At the time, Google billed this feature as a way to send and receive Android apps without Wi-Fi or cellular connectivity. Peer-to-peer sharing can also conserve data and is ideal for places with slow networks

You can still use Files by Google to share Android applications in a similar manner. Under Categories, go to “Apps” and then the overflow menu for what you want to “Share.”