I don’t have a source but this is based on my membership in the Kagi Discord server. Kagi search has decided to allow people to opt out of Brave results being included in the results and may asking Brave for free API access so that they aren’t being supported. I’m still unsure about whether I’ll resubscribe to Kagi. I might give Startpage a run for a bit.
People were also put off by Kagi’s response to the whole thing. At one point they claimed that “politics is one of the reasons no more innovation.”