They are the biggest search engine; every SEO trick, every spam attack is spearheaded against them. But also being the biggest and the inevitable, they can afford to blunt their search tool somehow in order to show more lucrative sort-of-hits and sell more ads. A moral hazard to do such a thing is always present fr any market-dominating player.

Kagi, in comparison, is tiny, and almost nobody cares to attack their algorithms. Back in 1990s, when Macs were a small minority in the PC-dominated world, they were the safest desktop machines, because almost nobody cared to write malware for them. Now that Macs are a sizable segment of computers in hands of important people, they are targeted by malware all right.