Removing a background is a solved problem. The models that do it are open, well licensed and small enough to fit in a browser tab. Yet almost every tool built on them still asks you to upload the photo, wait in a queue, hand over an email address and then accept a downscaled preview unless you pay.
None of that is a technical requirement. It is a business requirement. A server-side product has to charge for GPU time, so it has to meter you, so it has to identify you, so it has to hold your images. Every friction you have ever hit in a free photo tool traces back to that one decision about where the model runs.
So we moved the model. Your laptop and your phone are both fast enough to run a modern segmentation network. Once the work happens on your side of the wire, the upload disappears, the queue disappears, the cost disappears, and the reason to hold your photos disappears with them. The product gets better in four directions at once, which is usually a sign you have found the right constraint.
The result is a whole studio of tools rather than one clever trick. Cutting a subject out is only the first move; most people then need it on a white plate, at an exact pixel size, under a file size limit, in a format the form will accept. Splitting that across four websites is how the job normally goes. Keeping it in one tab, on one machine, is most of what we are actually building.