Real-time multiplayer in Play Game Services is going away on March 31, 2020

グーグルゲームサービスのリアルタイムマルチプレイヤーが来年の三月で終了します。
以下googleからのメッセージ
＞We’d like to inform you that on March 31, 2020, the real-time and turn-based multiplayer APIs in Google Play Games Services will no longer be available.
Action required
Because some of your games use one or both of these APIs (listed below), you’ll need to find replacements in order to continue offering multiplayer experiences. Migration options include using Firebase Realtime Database for multiplayer hosting and Google Cloud OpenMatch for matchmaking. You can log into your Cloud account to use Firebase Realtime Database for free with the Spark Plan.
We know this change requires extra work on your part, and we thank you for your understanding. If you have any questions or concerns, please let us know by filling out this form.
Your affected game(s)
We've included a sample of affected games below, up to 20. Please note that you may have more affected games beyond those listed here, so we encourage you to review your entire app catalog to identify which games may need to be updated.
対象リスト
jp.recitative.rimanzu

新しいマルチプレイヤーゲームを計画中だったのですが残念です。

対策

Firebase Realtime Databaseを使用する
色々と作り直さないといけませんがFRDのほうが使い勝手は良さそうです。
以前作成したゲームはFRDに対応するまでシングルプレイ専用になります。