Have fun making these look good with nothing but wanding. Most of them have glow or soft edges as well as edge luminosity, some of them are even artefacted to boot. In short these images are a major pain in the ass to make transparent and almost certainly not worth it
I did give a try at it using mostly the magic wand and it came out ehhh

okay I would say at least on lighter background, a darker background just would show how bad my quick edit job was. A soft eraser would make the edges a whole lot better but that actually takes time compared to something like the magic wand.