I have a feeling that China hates Geohot because they blocked blackra1n.com and now they also blocked limera1n.com however, even if i have limera1n.app on my device, i still need vpn to download cydia.... But they didn't block any other jailbreaks in the world such as spiritjb.com greenpis0n.com redsn0w etc. But luckily, The Chronic Dev Team another jailbreak instead of limera1n! So yeah! Go Chronic Dev Team!!