Add note about the Kakaotalk bridge being dangerous to use

docs/configuring-playbook-bridge-appservice-kakaotalk.md

@@ -2,6 +2,8 @@
 
 The playbook can install and configure [matrix-appservice-kakaotalk](https://src.miscworks.net/fair/matrix-appservice-kakaotalk) for you. `matrix-appservice-kakaotalk` is a bridge to [Kakaotalk](https://www.kakaocorp.com/page/service/service/KakaoTalk?lang=ENG) based on [node-kakao](https://github.com/storycraft/node-kakao) (now unmaintained) and some [mautrix-facebook](https://github.com/mautrix/facebook) code.
 
+**NOTE**: there have been recent reports (~2022-09-16) that **using this bridge may get your account banned**.
+
 See the project's [documentation](https://src.miscworks.net/fair/matrix-appservice-kakaotalk) to learn what it does and why it might be useful to you.