Look at the numbers per capita, and look at the economic inequality indicators.
> sending money to Brazil from Europe
How much of these 100€ are going to get to the hands of the recipient, if sent by the "traditional" route? How fast can this money be made available to the recipient? What exchange rate is going to be used, the one offered to big international traders or the shitty one that banks offer to tourists? How much will be taken in fees by the banks? (not taxes, fees...).
I'll tell you: there is a good chance that middlemen are going to eat 7-12% of those 100€, just because they can and no competitor can challenge them.
And this is only for the first movement. What if the recipient in Brazil wants to have the money to buy something back in any other part of the world?
> You could tell us why you are not able to explain what's the advantage for the average internet user
Much like Bill Gates could not really explain the advantage of the internet to a privileged person in 1990's America?
Honestly?! I am tired. I might be throwing tens of different possible use-cases, and to all of them your reaction will be "I can do that already, all I need is <insert middleman service provider>". There isn't much to say, is there? If you are satisfied with the status quo and you don't see a need for decentralized technology meant for disintermediation, good for you.