(Disclaimer: I’m not a fan of using GenAI, so I may be biased lol) I’d say it’s okay only if the AI part of it is detecting the background boundaries, and not regenerating part of the image. For example, if you’re removing the background of a picture of a house, the AI algorithm should only be finding what parts of the image are the background, and turning those parts transparent. But if the program regenerates any part of the actual image content itself (e.g. if it modifies the house in the image), then I’d say that enters disallowed territory. The best way to tell if the background remover altered the actual image is to zoom in on the same spot in both the original and modified image, and look for weird artifacts or differences in the modified one. If they look exactly the same, you’re in the clear, but if you find artifacts, then it’s been regenerated and would certainly count as an AI-generated image.
If you’re worried about AI, I personally used GIMP’s magic wand tool to select parts of the background and delete them, then touched up anything that I missed with the eraser tool. It’s more tedious, but works well if you want to avoid using GenAI, and allows you to have more control over how the final result appears.