I don't have ads on my SearXNG instance and I find that its comparable to Kagi. Have you tried searching with SearXNG?
Also as a former Google employee... I dig the idea of contributing funds for some competition in this space.
docker run -d -p 9017:8080 --name searxng_data -v "${PWD}/searxng_data:/etc/searxng" -e "BASE_URL=http://localhost:9017/" searxng/searxng:2024.8.31-769b2ed03
I run this from the directory where I want to store the data on windows (hence the weird PWD thing). I also use cloudflare tunnels and have the internet facing website, https://sear.mydomain.com, pointed at http//localhost:9017. I set up all my cloudflare tunnels with email authentication. My token lasts a month (but is configurable to whatever time frame you like). My traffic is strictly mine, so it seems to be working ok.Its basically no maintenance after this setup. I can mess with all the settings (except results format) from the main interface.