Well already suggested, a lot of people disagreed.
Me as a person who has an unstable internet and power (electricity to power the router)
-I agree, and you can't rejoin a game after a specific short time, 3 minutes for example. I agree +1
-from the other side, they will definitely be abused, if someone attacks you and if you wanna run but you can't you will leave and rejoin, if it's a skywars/pvp minigames. So having it in 1 gamemode where you can actually respawn which is obviously eggwars, this is helpful.