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I think they are using image segmentation with Deep Learning. The technique should be similar to this. Of course, there will be some traditional CV techniques as well.

https://github.com/anish9/Fashion-AI-segmentation

Impressive idea and execution! How could I never thought about this? :)

More specifically this:

https://github.com/facebookresearch/deepmask/blob/master/REA...

I think many mobile device/camera apps have been doing this. The portrait feature where the background bokeh is artificially made is using a similar technique.

Usually cheaply paid humans.

That doesn't seem plausible. It works too fast and the results are too good.

Perhaps this? Was posted here a few months ago. Going to look into it. https://towardsdatascience.com/background-removal-with-deep-...

No chance this is done by a human. It's way too quick, and it makes mistakes that humans wouldn't make.

/sarcasm

Maybe not true here, but far common than people care to admit.