They used this app to organize violent riots, taking advantage of the pacifist demonstrations organized by the pro-secession political parties.
The big problem in Catalonia is exactly that the ratio is around 50%-50%, but the status quo is that Catalonia is part of Spain, so the pro-secession will keep protesting, and the government shutting them down, and more important, defending the 50%+ of Spaniards which live in Catalonia and want to remain part of Spain. No one talk about these ones!