Oh I see, sorry about that. It's what I get for being on my phone. 6to4 would probably have been more successful had it not allowed tunnelling arbitrary IPv6

Oh I see, sorry about that. It's what I get for being on my phone. 6to4 would probably have been more successful had it not allowed tunnelling arbitrary IPv6 addresses, not used a different protocol type, or broken the IPv4 addresses (by adding the 2.0.0.2.ip6.arpa DNS zone), but I agree it's basically the same thing.