Note that malware of various sorts has done all of this for years. It used to be...

SAI_Peregrinus on Dec 5, 2020 | parent | context | favorite | on: 72% of smart TVs and 46% of game consoles hardcode...

Note that malware of various sorts has done all of this for years. It used to be reasonably common to get command/control server info via IRC, basically DNS over IRC. DNS blocking has never been an effective network management strategy, and it never will be.