Right but that doesn’t mean anything about authorisation. If you’re using a key you ripped from an official app you could easily be blocked tomorrow. Makes the effort considerably less worthwhile.
Then you rip the key again from the new version of the app. But they won't do that because it would block the app.
It's the #6 most popular website in the world. Chances are, someone will fix the libraries or investigate and write about any changes done to the internal API pretty quickly.