Judging by the opening post, the intention seems to be to use this on your own IP (hence them pointing out you can use it on localhost) to easily translate exis

Judging by the opening post, the intention seems to be to use this on your own IP (hence them pointing out you can use it on localhost) to easily translate existing production material into Figma or similar tools where designers can then iterate on it, without having to replicate the existing interface pixel-for-pixel beforehand. So it's probably a very grey area to use this on other sites, but that's not the suggestion being made.