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Re:Via-ipv6.com: enabling IPv4 sites for IPv6 only networks by noipv6 on Thursday October 17, 2019 @02:27PM (#21284988)
6to4 has been de-preferenced by most operating systems.

what isps provide 6to4 tunnels, or even 6in4 tunnels (which i can only assume you meant?)

(agreed on the proxying point, you'd have to explicitly trust the proxy operator)

Re:Via-ipv6.com: enabling IPv4 sites for IPv6 only networks by tlb on Thursday October 17, 2019 @03:15PM (#21285431)
It's de-preferenced relative to v4. Which, if you have v4, you should just use directly.

I was wrong above -- NAT64+DNS64 (not a tunnel) is generally what v6-only ISPs provide.