So, yesterday's thing was, DigiCert is dumping IPv6 support after their current CDN, Edgio, went bankrupt.
(2 longstanding companies merged and rebranded onto a colonial .io domain and filed for bankruptcy 2 years later, eh?)
But DigiCert also recently acquired the oft-DDoSed DNS service UltraDNS (to go with the other DNS service they acquired before), which uses Edgio for DDoS protection!
(traceroute an UltraDNS nameserver like pdns196.ultradns.com or b.cctld.us, you may see AS22822/llnw.net near the destination.)
Wonder how that's gonna go.