Logging is on by default and per system. So yes, that is definitely possible. The majority of users are my children so I don't feel the need to inform them and the SO was not fully informed other than "tell me if it breaks something".
It's a good question to reflect on though. If I install this at my parents should I tell them. The whole world is monitoring their DNS now and after this only (potentially) me and NextDNS.
Thanks for your reply. I usually cant inform my SO more anyway, simply not understanding the technical limitations or reasons for something, but I do always tell.
I'll be checking out nextDNS for sure, even though its just for seeing what its about etc.
It's a good question to reflect on though. If I install this at my parents should I tell them. The whole world is monitoring their DNS now and after this only (potentially) me and NextDNS.