Semi related +1 for mojeek powering their results. Kagi gets a lot of favour on HN, worth a nod to Mojeek for powering their organic results to an extent.
hmm, I am not certain that I prefer the option without the source listed. For example, I might prefer an image from Wikipedia over another image. Or if I am searching for a map and the URL has the word 'historical' I would not choose that one. etc.
It depends on what I am searching for and why I want to use it.