They don’t allow any search engine in safari now that apple has become an ad network. This is why there’s a weird workaround for Kagi. The search for pay deals are the priority. For those on Mac devices, Orion is excellent now imo.
It sounds like they’re also trying to ban Google from paying someone (like Apple) to be default so if they did, Apple might no longer be disincentivized to build their own search engine (or at least do a DuckDuckGo and stick their branding and ads on top of licensed Bing results or something). That would represent more competition. (Although it would probably kill Mozilla too)