I have the feeling that the cloud based providers are just using the freely available segmentation models. It's just speculation, but it doesn't seem to be top priority for them, so they'd just bolt on anything that works.

A problem is also that the cloud solutions need a complex UI to surface segmentation to the user. But the point you have there is that those models are probably not prime time ready yet, surfacing them would actually reveal they are not as powerful as the user expects. Destroying the illusion that AI can just do anything at will.