The DNS based cdns won't be used like Akamai and Apple Edge Cloud. They use eDNS to get the subnet info when a lookup is made to steer traffic.
You can do the tests in command prompt or terminal to see what you are getting for example
nslookup i-live-cache.akamaized.net 169.1.1.1
vs
nslookup i-live-cache.akamaized.net 1.1.1.1
If you want to use 3rd party DNS you can use ones that send the subnet info for example 8.8.8.8 or 9.9.9.11 (
https://quad9.net/support/faq/#edns)
You can check Apple Edge Cloud via the below link.