This QoL alteration will be pretty simple. You cannot repeat the same (or similar) message unless you switch servers in between. If you barely chat and just say "Gg" when the game ends, it will not let you. Since those are the exact same messages, the chat will say "you cannot send the same message twice." I understand that this is to prevent spam and it still will with this suggestion. The message repeat filter resets for everyone when a game starts/ends. I doubt chat can be flooded rapidly regardless.