@w0w
Black hole ?
It might be very possible that these guys https://ipv6.he.net/certification/ are one of the very few that offer 'pure' non f#ck#p up IPv6 access on the entire planet.
They actually own and exploit the word wide interconnection cables, mostly on the bottom of the seas.
I tend to think they somewhat invented the IPv6 Internet (ok, not true of course) but they are one of the few that adhere to all the IPv6 RFCs.
A fact it : their access is not 'home' based, they use POPs in every country. And as such, there are some draw backs like speed and, as said above, the connection can be seen as 'VPN'.
Anyway, it us up to us right now to select the right ISP. They are all somewhat IPv4 aware these days - it took them 30 or40 years, but things got ironed out.
Now, up to us, with our choice and out wallet, to vote for the next ISP "that does things right".
For me, he.net was, in the past, a no-brain solution.
I would still using them today, if it wasn't for my (and now I should be using a shipload full of angry words) current ISP that can not 'route' (firewall) (handle) protocol 4.
Yeah, great, it does '6' = TCP and '17' = UDP, and "1" = ICMP, but not "4" .... and this "4" is needed to access he.net. As the Ipv6 packets are packed into a IPv4 packet, hence the IP-in-IP or 6to4.
I've called and written them, my ISP, Orange, and asked them : your first box supported 6in4, your second also. And version 3, and 4 and 5.
Then I got the box number 6, needed because it had the build in fiber ONT.
But no more 6in4 support.
Ok, this box supports IPv6, but it can only offer one (1 !) prefix. And you can't use it in any firewall rule ....
And this is called their 'Pro Box', because they think that companies have "just one LAN" 😠
Ok, so be it - I negotiated a 50 % price cut, as they only do their work "half way".