[outworlder]

> "I found out they were developing an app for themselves"

This is the reason, no need to look into it further. They probably sunk a lot of money in what turned out to be a crappy app. Knowing how these things work in Brazil, I wouldn't be surprised if the company developing it had ties with the school's administration. If so, a crappy app wouldn't usually be a problem... until this guy's app appeared. Then, the development costs will have to be justified.

Notice how they didn't complain that the student was making money. They don't care about that. All they care about is not looking bad, while furthering their agenda.