The websites shown in red do not provide an AAAA record.
I guess that’s better than providing an AAAA record and having no connectivity (or unmonitored connectivity) to the address that the AAAA record points to /-:
I’m surprised that the big Chinese websites (Baidu, QQ, Taobao, etc.) don’t support it, since I thought that China was an early adopter of IPv6.
How about a wall of shame for sites that distribute software without a signature for authentication? A public wall of “shame” should at least try and solve something. Mobile devices are the primary devices using IPv6, and 6to4 provides them access to the existing v4 internet, for mere mortals.