Quad9 is operated by the Quad9 Foundation, a Swiss public-benefit, not-for-profit foundation with the purpose of improving the privacy and cybersecurity of Internet users, headquartered in Zurich. It is the only global public resolver which is operated not-for-profit, in the public benefit.
It’s a DNS provider from the police, it would be bad for them if the couldn’t resolve those domains
Why do you say it’s from the police?
Quad9 is from global cyber alliance and that is, among others, from the police of london (https://www.cityoflondon.police.uk/). they are listed among the partners on following site. I can’t find another source right now. https://www.globalcyberalliance.org/become-a-partner/