One of the problems mentioned in the article is that all major browsers are starting to automatically set your browser to ignore system settings and just go to

One of the problems mentioned in the article is that all major browsers are starting to automatically set your browser to ignore system settings and just go to Cloudflare or Google DoH servers. No matter what you do locally (unless you locally serve the do-not-auto-doh flag), you'll have to touch each of your browsers on each system to not have this behavior.