kagi
"But their other index providers have done bad things too! Why do people not complain about that?"
The reason people are upset with Kagi isn't really that they're using Brave as a search provider, that's just what unearthed the actual problem here: that the people behind Kagi believe that technology is neutral, and that it isn't their job to care about politics (which in practice means supporting oppressive systems).
That is rather a slap in the face from a company that claims to be building a 'humane' search, which *necessarily* involves politics.
re: kagi
This doesn't mean that "using Brave as a provider" doesn't matter to people *at all*; to be clear; just that the conversation of "what other indexes are problematic" is a moot point and not worth discussing, because the company itself has already shown itself incapable of dealing with these concerns appropriately anyway.
So no matter what the outcome of such a discussion would be, it will change absolutely nothing until Kagi takes their head out of the sand... so why waste time arguing it?