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True, but at the end of the post the author also explicitly rejects the idea of the DoH protocol in general on questionable technical grounds, so clearly their objection isn't just Cloudflare. I think the argument would be a lot clearer if they didn't conflate "using Cloudflare for your DNS" with "using the DoH protocol for DNS" even if they think both of them are bad.

Now that makes more sense regarding this point. I missed the date. I think the submission title needs (2018).

Even back then, wasn't Cloudflare just the only listed option? Couldn't you still have manually entered a different DoH server that you knew of?

That’s not true. Back in 2018 firefox had the option to use cloudflare or enter another DoH server IP.

Cloudflare is still default.