I'm the site's founder - happy to hear you're impressed with the background removal. I think it's pretty much on par with remove.bg, which are the most famous competitor in the category.
Couldn't help but notice you omitted any reference to the major technological achievement here in placing objects on arbitrary backgrounds. It failed to impress on your use case?
I get that this site didn't just appear. You had to put some work into it. I like it. BTW, I applaud you for not having to force users to create an account just to test it.
I did a few images and it was interesting. I suspect, if I pick the right background and and the right images then this would be very handy at scale. As a solution, besides how it's accomplished, the tech, how does this differ from using GIMP's API to merge two images? I guess that's what I'm missing.
Couldn't help but notice you omitted any reference to the major technological achievement here in placing objects on arbitrary backgrounds. It failed to impress on your use case?