Earlier quoted context omitted.
> DNS-level routing and load balancing How do you mean? Why should my ISPs hijack communication between me and a content provider and reroute it? This is as if I'm in a phone meeting and when I say "let me call you back at 15:00" the phone company injects "19:00" instead, because that's a time the phone network is less loaded so it'd help them. > NAT64 embedding ipv4 addresses into ipv6 ones NAT64 is a good point, ac…
Some authoritative DNS servers may respond with incorrect IP addresses for specific IP subnets of an ISP (i.e. pointing to unreachable or slow far away servers), so it could be useful to fix this either statically or by forwarding domains to another DNS resolver which gets proper responses. Things like that.
Half of global loadbalancing is getting around ISPs doing stupid shit they shouldn't have been messing with.