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Being the host country for the World Cup gives its own privileges to the hosts because they (countries) can participate in the qualifying round without any burden (Canada, Mexico and USA must have secured a place in the qualifying round)
so that's why many countries are scrambling to try to register their country to be the host especially countries that are self-aware that the quality of their football is still low LOL
Being a host will give them the chance to be in the world cup playing against the teams but in fact when the team is not ready for the world cup and they are not really qualified normally they will just lose all the games and leave the World cup fast, just like what happened to Qatar and it doesn't matter how much money they spend for the world cup.