Facebook has the resources and technical expertise to make quite a good pass at figuring this out. This is also unlikely to be the only situation of this sort t

Facebook has the resources and technical expertise to make quite a good pass at figuring this out. This is also unlikely to be the only situation of this sort that they will ever deal with, so the experience of addressing it should be of some value to them too. And this is the sort of technically challenging yet fun and impactful project that helps keep skilled engineered happy. My point here is simply that trying to solve this problem is not some huge net negative for Facebook. They don't need to be perfect. A rough solution would not require a full and complete legal analysis of Brazil's laws and topography. However their current stance seems to be that they won't even bother trying.