> google meet and google duo is a “CIA chat app”? Why?

> What does that mean?

It means that the app may be used to advance CIA goals. It means that the CIA has control of the app along any dimension you're worried about. This is the nature of obfuscated relationships. If you're worried about something, and it's likely to be true, you need to assume that it is true. In this case, the assumption is justified. If you're not worried about something, you don't need to make the assumption that it's true. Since it doesn't matter, you can afford not to have a position on it.