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The scapes are a single, or limited number of viewpoints. A video is not, it effectively contains parallax information because you're moving along the track (and you can easily have GPS data recorded as well); a wide angle could capture enough detail. A track need not look correct in the reverse direction, but that'd need a second camera at most.If this was true, the Scapes wouldn't be limited to a single point in 3D space and you could "easily" move around. That's not the case though and I don't think it would be that easy. Let alone to it for entire tracks (huge amount of data).
I've seen (academic) videos of drones used to map areas, years ago. Now the "method" is for sale from more than one vendor. I've seen similar results from dash-cam footage with no exotic hardware and in fact photogrammetry has a great many interesting uses. The bonus is it's as easy as taking some photos and downloading some software.
How do you suppose Google Maps' / Earth's "3D mode" works?
The data size aspect is irrelevant when talking about point clouds in the same breath, it's just HD video. You can generate a point cloud from the pixel data, and in fact that's the easiest, basest representation, but it can also be used to generate polygonal surfaces.