Data on search engine market share is available, but I wonder what that looks like for Lemmy users in particular, who I would assume lean more technical than the average user, so probably use DuckDuckGo and alternates more than Google.
I use a mix of DuckDuckGo and Kagi. I'll also use ChatGPT, which can be good if you're careful to verify the answers it gives you as a check against hallucinations. It's useful for short, direct answers without ads or SEO bullshit.
Yes, that limited number of included searches is my only criticism I have with Kagi. They are aware of this, and are trying to offer customers more searches for the same price by improving their costs. I am glad they decided to do this by reducing their costs and have decided to not go the road of monetizing their users by selling ads and customer data.
However, I try to use Kagi only for serious search requests. For other very trivial searches, I use Startpage. For me, works OK. But I hope that one day Kagi offers enough searches, so I can just use it everywhere as my default search engine without thinking about it.