[1] Sometimes fails with "Invalid body" error
[2] Only recently-sent KakaoTalk messages can be deleted
[3] To make your KakaoTalk account leave a channel, send the leave
command in a Matrix portal room. Simply leaving a Matrix portal room will keep your KakaoTalk account in the channel.
[4] Kicks in KakaoTalk are equivalent to bans in Matrix
[5] Might not get synced on backfill or initial portal creation. Might get synced on live update to channel name/description