@Bazile (a pity you're not from Brazile, as we could have a pun time with that)
In a way, by inviting in the whole world, for a party, maybe it will serve to shame the elites, in Brazil, to put some infrastructure in place to clean up that muck.
But, as we know, it's hardly a profitable business sector and the elites won't see/smell the benefit as they must already be residing in unpolluted areas. A sense of public duty and making life better for the less well off is usually lacking in purely capitalist economies so perhaps the Olympic spirit will show them the way?