http://gpp6nwvsps43b3mfacsh433uroo6uyjvvpr6tgj4jh4n5ngxt7rqbvid.onion/posts/tor-not-free-countries.html
Occasionally users in China manage to find a public obfs4 bridge that is not yet blocked. If the metrics numbers are right, bridges are not necessary as often as you might think. Even in not-free countries, people appear to frequently connect directly.