Not familiar with the situation in Brazil, but it could be as simple as local credit being harder to get than global credit, or a desire to deal in a denomination that local credit doesn't typically offer without hitting a conversion fee.

A local farmer could perhaps figure out how to contact a swiss banker all on their own, but it would be a lot easier, and cheaper, if there were single place (or better yet, a few competing places) that offer a central place that anyone looking to use/supply credit could come together.

even the title says the bank does not give you the loan

because blockchain blockchains!

I must confess I'm enamored with the concept of blockchains, but find their value questionable for the most part.

I even worked for a blockchain startup (non-crypto) but left on less than good terms and a fair amount of PTSD. They were nuts!