I think Google peaked about 6-8 years ago now and then started slipping at an ever accelerating rate.
It’s almost useless for me when searching anything remotely technical or otherwise niche.
I almost consistently need to go to the second page of results now, something I don’t remember doing since like 2009.
I find Bing acceptable. Brave search works well. But I’m actually using Kagi now since I’m hoping their paid model will actually mean I’m not the product.
They do have their own crawler and I believe supplement from bing only when necessary. Something like 98% of results are from their own index across all users. They actually have a breakdown for every search.
I think they actually have the largest independent index outside of Google/Bing right now.
Others that exclusively use their own index are:
Mojeek (results aren’t great)
Kagi (result are pretty good imo)