I hope the govt sees the reliance on this service and does something positive about it (for example, build their own or tie up with some company). Such massive dependence on a company with no contracts is going to end up in a mess later.
On the other hand, using a government issued instant messenger seems even more dangerous. I think Brazilians have more to fear from their own government than foreign governments.
Do we really have democratic nations that would rather rely on some corporation than the government? Is brazil such a nation. That is semi-alarming to me.