For background removal, I get good results with isnet-general-use and u2net, available through rembg or huggingface. I've also been getting decent results with DIS-v1 on replicate.
The results vary so widely, especially if there are blurry or light areas, it's necessary to have options. It can also be very helpful to do preprocessing image enhancement, to remove blur or upscale, prior to the background removal. I'm sure you could even take the alpha mask from the enhanced image and use it on the original image, to help in cases where the source image has issues.
There also needs to exist a service for interactive background removal, via automatic and/or interactive segmenting. Sometimes the models need a little help, and I think it's rediculous that I still have to trace paths when the models fail.
Anyway, I love the idea and pricing model, will def try it out, but I'd like to see more details on the models being used, and I'd like to see more options and configuration.
This looks like a fun startup, I've thought of doing something similar. There's a lot of room to grow with other AI image manipulation models, not just for background removal. Shoot me an email if you would like to discuss.