This just shows the complete decline that Brazilian football is in, the last best player in the world was Kaká almost 20 years ago. I think the award given to Rodri was fair, Vinicius is not yet a complete player and responding to the OP, I think it is very difficult for 100 people to think the same way, there may even be some prejudice but specific cases that may not even interfere in the final result. There are 100 people voting... if Rodri won it was because he deserved it.
Between Brazilians had high expectations for Vini Jr to bring back their declining football success and they've not been impressed ever since Rodri got the award. I noticed that the nation have not been winning Balon D'or for a while, but it's not up to 20 years since Kaka's last win in 2007.
However they still play good football, their only barrier is the ever increasing emergence of stars in different countries and the efforts they also put in the pitch. Awardees are given equal rights to win depending on the performances in their name, not just about nativity.