To be popular in Brazil you must have an app on Google and Apple stores.
We can possibly do it on the Google Store, but it would just be a wrapper around the website. Do you think that's still worth doing?
That's the only way to actually reach real big number of users in Brazil. Even for Twitter, Instagram and Facebook that are perfectly accessible via site, the vast majority uses apps. But that's not an assurance of success. You still will have to have a good strategy to make people choose NOSTR at first, and then to choose your client/app.