I use Tor Browser as one of my main browsers, and the fact that often kagi gives a 403 error is very annoying and makes me reconsider if kagi is the right option for me. Would be nice if either kagi finds a way so we can use the service over Tor.
If the onion address is set up contacting the kagi servers directly, without passing over the GCP http servers, it will give Tor users an option to bypass the blockade and be able to use the service.