But, USA or Mexico or Canada do not need to spend this much, nobody should, they just need to maybe polish up a bit, like maybe 10-20 billion, but that is about it and nothing else is needed on top of that. And that is with all the added improvements, maybe not even that much if they do not want to do anything at all, they can just stay as it is and can still do it without a doubt.
of the three countries, mexico has the lowest economic capacity while the USA and Canada have a pretty good economy, in this case, mexico is quite profitable
Are the countries hosting the world cup not supposed to individually develop their stadium on their own? Since it's not like the three countries involved in hosting the game will come together to make one stadium available for the game.
Even if fifa is going to allocate monies to this countries for stadium development, it will be on individual scale, country with an already developed and well furnished stadium will get less allocation for minor fixes, while country with a stadium that need a total rehabilitation will get a higher allocation to make sure all is well put on place before the start of the tournament.