You were told wrong . Otherwise there would be 2 hosts per match... 1 on your team and 1 on the other. That is not possible. 1 Host for the entire lobby. In reality no one knows who is host. I can only speculate they do it so players wont leave as soon as they see that the host is on the opposite team.
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Ok then explain being a host thanks in advance
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I cant explain it properly , but imagine it this way: Your game sets the standard for everyone else . Everyone connects to you in order to calculate postions in game.