Quad9 behaves exactly as I expect a DNS to work, in the sense that I only remember I use it when the topic of DNS pops up.
Are you saying now you just had issues with the quality of service? Or do you want to provide more details to substantiate the claim that they were blocking sites?
I used the term "blocking" in a loose sense. I have no idea if Cloudflare was failing to resolve certain domains because it is a shitty service, or if it was ordered to block those domain names by its government, or if it was actively not resolving domain names because it thought a good idea to be a sort of arbiter and gatekeeper. I suspect the last option, but it is just speculation.
What I can affirm is that I had issues more than once with domain name resolution when I used 1.1.1.1. After it annoyed me enough I switched to Quad9, and it has been great ever since, which is why I recommend it as a user of their service.
I'm going to go with option D) whatever shitty site you were browsing to had a broken DNS or more likely DNSSEC configuration and Cloudflare was correct to not serve a corrupt response.
99% of the time, tales of "they're blocking my site! you guys are nazis!" always turn out to have a root cause of broken DNS configuration.
And once I switched DNS I could browse it normally.
This does not align quite well with the scenario you propose.
> "they're blocking my site! you guys are nazis!"
I said no such thing. I said it was a shitty DNS because it failed at the thing I was trying to use it for.
There's this thing - when you offer a service to the public, the users of your service, can, will, and should review your service.
So, yes, I am free to "trash talk" a service that was, frankly, terrible at its job in providing domain name resolution. That works as any other user review, a data point so other users may switch away from a bad provider to a better one.
I imagine if someone goes to a restaurant and they their hot dish is served cold, if your response to the user review is a silly request for proof that the food was indeed served cold, and whining that their review is "trash talking based on fear and guesswork".
I offered some possibilities of why they did a shitty job in providing naming resolution. I even speculated what was the most likely one (not the one you mentioned).
But it's okay, at this point I have very little optimism regarding your reading ability.
ASHandle: AS19281
Street: CleanerDNS Inc. dba Quad9
Street: 1442A Walnut Street, Suite 501
City: Berkeley
State/Prov: CA
Country: US
They also have servers in the US, so that's yet another reason not to consider them "100% safe from US government intervention"