@cure53 on the other hand, it does not seem to be Grok specific. Other models available also make the same claim that there is no verified evidence:
GLM-5:
Kagi Assistant
Better search results with no ads. Welcome to Kagi (pronounced kah-gee), a paid search engine that gives power back to the user.
(kagi.com)
Kimi 2.5 (although it states its cutoff date is early 2025, so that would make sense):
Kagi Assistant
Better search results with no ads. Welcome to Kagi (pronounced kah-gee), a paid search engine that gives power back to the user.
(kagi.com)
Deep seek v3:
Kagi Assistant
Better search results with no ads. Welcome to Kagi (pronounced kah-gee), a paid search engine that gives power back to the user.
(kagi.com)
So I don’t think that we can conclude that Grok was altered specifically.