Offering Oblivious DNS over HTTPS (ODoH) is not currently on the Quad9 roadmap. Although there is an open feature request in GitHub to support ODoH in the open-source software used by Quad9, and assuming that is implemented in the future, there are significant security concerns and complexities involved that would make this an incredibly difficult protocol to support while maintaining the integrity of our services. Quad9 will continue to keep this in mind in the future and once supported in software.
9.9.9.9