"The service" is the DNS service. If you send random garbage to random IP addresses I think you waive the right to privacy.
>Huston emphasised that APNIC intends to protect users' privacy. "DNS is remarkably informative about what users do, if you inspect it closely, and none of us are interested in doing that," he said.
Maybe it is reasonable to take them at their word as they seem trustworthy, but we should at least consider the fact that at least some of this DNS traffic is indeed being analyzed.
Users of the DNS service get the privacy guarantee.
Non-users do not. If you floodping 1.1.1.1 you are not a user of the DNS service and the privacy terms don't apply to you. Rather you're a member of the Misconfiguration Club, and the site you're pinging has the usual right to analyse your pings.
I get the general idea, but having "user-privacy oriented" and "we collect everything and make it available to many researchers" services under the same IP may lead to some issues.