Comment by edutechnion

Changes made by large companies that relied 100% on DYN:

* us-east-1.amazonaws.com: split between internal, UltraDNS, DYN

* spotify.com: all internal nameservers now

* reddit.com: all Route53 now

* github.com: all Route53 now

* netflix.com: all Route53 now

* paypal.com: split between UltraDNS and DYN

No changes made:

* twitter.com: 100% with DYN