https://quad9.net/ lists as being founded by Global Cyber Alliance, which was founded by City of London police, Manhattan District Attorney’s Office and Center for Internet Security.

Quad9 openly operate in threat intelligence: https://quad9.net/news/blog/protecting-millions-in-asia-a-ca...

City of London and Manhattan District Attorney’s Office suggests finance is a factor, so I'll hazard a guess that Quad9's telemetry is useful for protecting the interest of finance: e.g. learning of new/popular domains that might be tricking users/businesses into fraudulent activity.

Quad9 meanwhile have the remit to provide the best public resolver, including fighting cases as they do.