The authenticated-page support is what caught my attention. Being able to grab an internal dashboard or admin UI and get editable Figma layers from it could save quite a bit of tedious recreation work.
It is also a very easy win for a company to just focus on the one stolen element or component in a lawsuit to knock competition out of the space and has happened multiple times.
In large corps you usually have separate teams for the UX design to the frontend devs and the people specifying the features.
In such a scenario the UX designer can utilize such a bookmarklet to get a quick copy of the existing dashboard into figma to then iterate on the UX and try out different approaches for that specified feature.
This scenario would not be in violation of any terms and it's unclear what noobplus was actually thinking of