Nope. For 2nd item, I don't see a reason why GFW would do that. I did see some domain names resolved to 0.0.0.0 or 127.0.0.1 which is nice and easy and unlikely going to cause a problem. And in most of cases, the host names were actually correctly resolved but the request either timed out or got a connection reset error etc. as such methods are the cheapest way to block accesses at scale.