It's called
ECS. Allows a DNS server to pass part of your IP to the authoritative DNS servers. Only a handful DNS servers support it, such as Google, OpenDNS and Quad9's 9.9.9.11.
I could support it with a single server, through the single server, no need for VPNs or whatever, but... it also means that users would get a lower level of privacy. I don't think that users would want that. I can do a poll or whatever if enough people ask for it IG. Hope that makes sense.
Also "The google server 90DNS returns for me is 10x slower than the server my local DNS returns." -> Your ISP has poor peering, complain to them, not me.