https://kagi.com/images?q=https%3A%2F%2Fs3.amazonaws.com%2Fp...
Lets use this as an example. I would personally like to have a list of exact results. Separately - a list of similar images would maybe be nice. But tbh, 99.99% of the time with reverse image search, I am trying to play detective, not find similar images. I am usually looking to see the first, original source of something. Or maybe other places I can find this image.
I will point out that detective stuff like this is crucial to try to prevent being catfished, or phished. I am not ignorant that it is also a concern for those who don't want to be found, for privacy or safety reasons; however some threat actor could just find a less public reverse image search I'm sure.
It's a separate login? That's really weird, isn't it?