DDG is for-profit and serves for the most part Bing results. Why not pick something truly open, like search.marginalia.nu?
A Debian (or FSF, or ...) hosted SearX instance would indeed be interesting and perhaps most Free.
I worry about the sustainability of such a service though. Don’t they inevitably get blocked upstream?
It might work better for more local organizations to host such projects. I’ve always liked the idea of community centers and churches and whatnot hosting shared services for their community.