Lmao sorry to tell you this, but that was a team of 6, according to the dude in that screenshot. And they can't really cap a number of players in a team because there isn't even a team feature in skywars, people just do it because they can. Yes it's annoying, but there is nothing wrong with inviting friends to watch your back and sides, it's if anything a valid and intelligent strategy. Why limit yourself just because a few people may not like it? I suggest turning to some friends of your own and fight back at them :p