Android now forces apps to include proprietary code for push notifications

FOSS messaging apps such as Telegram-FOSS, riot.im, and other free software apps that need push notifications, are facing a wall. Google started leveraging its de-facto monopoly on Android distributions by forcing all apps to use its proprietary service Firebase for push notifications. Problem: The Firebase Android client library is proprietary, meaning FOSS apps can not use it.

Source: www.reddit.com