NextDNS doesn't return ISP cache servers IPs

Related to https://help.nextdns.io/t/q6h1t0y/strange-routing-to-cdn-sites:

❯ dig +tcp +nocomment chaos hses.akamaized.net @client.nextdns.io
dig: couldn't get address for 'client.nextdns.io': not found
❯ dig +tcp +nocomment chaos hses.akamaized.net @smart-ecs.nextdns.io
dig: couldn't get address for 'smart-ecs.nextdns.io': not found

My ISP has Google Global Cache and Akamai hosting (that I know of). NextDNS doesn't seem to returns my ISP's cache servers. 

Since ISP MiTMs port 53 DNS, I have to rely on DoH.

❯ kdig @dns.nextdns.io hses.akamaized.net +tls +short
a1834.dscw80.akamai.net.
96.17.182.85
96.17.182.84

From Google DNS:

❯ kdig @dns.google hses.akamaized.net +tls +short
a1834.dscw80.akamai.net.
203.171.247.224
203.171.247.218

Certainly does make a difference in terms of latency

❯ ping -c 1 96.17.182.85
PING 96.17.182.85 (96.17.182.85) 56(84) bytes of data.
64 bytes from 96.17.182.85: icmp_seq=1 ttl=55 time=56.5 ms

❯ ping -c 1 203.171.247.224
PING 203.171.247.224 (203.171.247.224) 56(84) bytes of data.
64 bytes from 203.171.247.224: icmp_seq=1 ttl=60 time=1.25 ms