

As I said in my original comment, I think it makes perfect sense to replace an itemised list - which needs to be constantly updated - with a generic “all major search engines” which covers everything.
If Yandex being removed isn’t an issue, then I’m not sure what could be termed as Proton being cagey.
For me, from a privacy perspective as a user it’s largely irrelevant what third-parties they use on the backend as long as my searches stay private.
Adding the statistics for third parties to their stats page would be neat from the user perspective, but I can’t imagine what value there would be in publishing that information from Kagi’s perspective.
As far as I know, Bunny is the only real alternative, but as you say, nothing will be as feature-full as Cloudflare.