Still it’ll only be visible on the server side, if you want it to be on everyone’s screen go through all the Players through a loop using for _, Player in pairs(game.Players:GetPlayers()) do and change the GUI that way
local DebrisService = game:GetService("Debris")
for i,v in pairs(game.Players:GetPlayers()) do
local guiclone = ScreenGui:Clone()
guiclone.Parent = v.PlayerGui
DebrisService:AddItem(guiclone, 5)
end