Depends on how you prefer to learn, but here are a few suggestions.
I've heard good things about the Computer Networks book by Tanenbaum and Wetherall, but I haven't read it myself. Very broad and comprehensive. The most hardcore way would be to make reading RFCs your hobby. It can be tough to get through, but if you regularly take half an hour to do it, you'll learn so much. I've recently started a course at https://classes.pracnet.net/, which is good too.
I like the idea of evolution (diversity + selection) applied here. Many people building it differently and letting the market decide what's most useful.
My take on this space is making it a browsable graph instead of 'just' a collection of lookup tools. The internet _is_ a graph, and it often makes sense to inspect linked resources (Domain name -> name server -> IP address, for example).
As for the longer-term vision, I'd like to make this graph as complete as possible. It now only has DNS-related tools, but adding ASNs, BGP data, hosting providers, etc. would make the existing tools more useful with every addition.
Internet infrastructure data is inherently open. I'm just presenting it in a more useful way. So any motivated actor can access it regradless.
In any case, exposing your IP during these lookups is bad operational security for them. So I would assume they'd prefer not to use Wirewiki.
All that to say: I don't feel conflicted about making these tools.