https://news.ycombinator.com/item?id=40013889
https://kagifeedback.org/d/3822-kagi-is-sponsoring-youtube-v...
"I watched Daniel King for 10 years and have previously donated to him, now I am happy that we are in position to sponsor his work which I believe is extraordinary.", this also definitely sounds like monetary compensation to me.
Thanks! I see why they may not consider this "marketing", even though it is obviously a sponsorship based on that information.