Why did GitHub not just put a Bitcoin miner or a BOINC client instead of the alert? The Chinese is not going to care about the warning anyway, it would be more educational to peg their CPU to 100% usage and make some spare change while you're at it.
This DDoS is mainly punishing people who are using VPN to skirt The Great Firewall (and people who use GitHub). What is the point of 'punishing' people who aren't doing this on purpose?