which won't be surprising if you think about a little bit - 8.8.0/24 is anycasted, which just means that multiple independent locations around the world announce the IP range, so that your requests broadly go to a nearby instance of it. that's great for your inbound requests, but if it
originated it's own DNS queries from that IP, then the replies would also get attracted to whatever instance of 8.8.8.0/24 is near the authoritative DNS server it just queried,
not the instance of 8.8.8.0/24 that sent them.
also, even aside from that, having some large fraction of the entire world's DNS requests coming from one IP address would trigger everyone's anti-DOS filters and probably lead to some extremely funny router catastrophes as all traffic hashes to one bucket or whatever.
