Code for question

local ds = game:GetService("DataStoreService"):GetGlobalDataStore("Test")
local players = game:GetService("Players")
local key = "key";

local function flip(c) return not c end

players.PlayerAdded:Connect(function(plr)
    plr.Chatted:Connect(function(msg)
        msg = msg:lower();
        if msg:sub(1, 11) == "sendmessage" then
            print(
            ds:UpdateAsync(key,flip)
        end
    end)
end)

function printOut()
    for _,v in next, players:GetPlayers() do
        v:Kick();
    end
end

ds:OnUpdate(key, printOut);