Earlier quoted context omitted.
Are you not concerned that you are leaking exactly what domains people are looking up in realtime? If I used a service like that I would expect some degree of privacy that goes beyond this. It's crazy to me that you're doing this to be honest https://plausible.io/nslookup.io/pages?period=realtime
There is no privacy issue here, there aren't source IP addresses attached, you can't tell who's looking these up. It's up there with Amazon's (for example) "other people bought" recommendations, you can't tell who did the looking up. They're just domain names which are effectively public records. And even if you thought you registered a super secret domain name (no such thing), maybe the registrar looked it up, or so…
You know the Qualsys SSL Tester tool? That has a checkbox about making the result public or not and that is because by default people wouldn't expect the domain to be leaked (even though it's already public information that doesn't really matter)