Telcos and App providers can contribute to make a democracy strong. And so do all citizens. But they aren't what is referred to by "institutions".
There is no widespread fragility in Brazilian institutions today. Recent events have shown they are strong as ever. Telcos and App providers have all their rights within the legal system to appeal the recent decision against WhatsApp and get their arguments heard. WhatsApp has already appealed to this judge's decision and this will be heard by an appeals court. This is business as usual in a legal system that is working.
Check the US for example, Apple was able to fight the government's request and prevail _before_ the government did anything about it, not after. In Brazil, Tim Cook would have been arrested right away.