One of my issues is that I just don't want to have to log into search. I use a bunch of different devices each day, some of which I control and some of which I don't, throughout the course of my work day. I don't want to have to log into Kagi on each one. It's much easier to just use a search that doesn't require a login.
Plus, it seems like having to login is inevitably makes it easier for them to associate activity with a specific real-like person. It's probably easier for them to associate my activity with me when I log in than it is for DDG or Google to track my activity when I'm not logged in and can't be easily distinguished from the dozen other people that used that computer that day.
Kagi privacy pass does not support disabling safe search, and is subsequently completely useless for a good chunk of the queries people don't want associated with their name and address.
Plus, it seems like having to login is inevitably makes it easier for them to associate activity with a specific real-like person. It's probably easier for them to associate my activity with me when I log in than it is for DDG or Google to track my activity when I'm not logged in and can't be easily distinguished from the dozen other people that used that computer that day.