ECS (Client Subnet) Implementation

I understand Cloudflare’s privacy focus (which is the reason I switched to Cloudflare) and the objection to implementing ECS (Client Subnet) support. That said, I ran across an article about NextDNS’ implementation which seems to work around the privacy concerns, as well as some caching issues.

Has this type of implementation been considered? Regardless, cool ideas and food for thought in the future.