Just a quick note for the unsuspecting: I run two local DNSes, one recursive and one forwarding. The forwarding one uses few services, like 1.1.1.1, 8.8.8.8, 9.9.9.9, etc. One day I noticed inconsistent responses and started investigating. Turns out that by default 9.9.9.9 have "protection" and for your safety will lie and return NXDOMAIN or something else, for some dangerous domains, taking into account their definition of "dangerous". I am not saying that this is bad, probably lots of non-HN people don't want to run their DNS or anything related and just want a tablet that works because they don't even have laptop. It just hit me hard because I did not expected filtering on these servers.