True.If the feds are after you, it doesn't matter which chat app you use, they'll already be on your phone. The data that is disclosed by the respective chat operator also depends on the country in which you live or whose nationality you have. Since different laws apply, the EU, for example, is much stricter than Brazil. I doubt that one chat app is more secure than another. Many people trust the false anonymity of the internet, which is a big mistake in first place.
Almost no app is safe. At least telegram admitted they can turn off encryption.
Unless you're actually under investigation, they would have to be contacted by the agency investigating.. telegram isnt just sending millions of contacts because they like dog penies's
Its always the very big name apps that get more talk like this.. I dont think matrix gets this much attention. Though it's more the encryption is setup by the user. But people want convince which involves trusting the app with your encryption keys