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I don't think they are providing a 'proprietary' format as such, it's just gcode tuned to different printers.

Reverse engineering the head paths to produce a mesh would be pretty difficult (though not impossible)

I think the reason they give you the opportunity to download another file is simply so that the gcode can be tweeked (for variable such as layer height, hotend temp, max acceleration of head etc.). It could be, for instance, that with your particular filament the gcode doesn't tell the hot end to get hot enough, and you end up with layers splitting. Or worse, a huge tangle of melted filament.

That language I quoted implies you're only allowed one successful print per purchase.

What you're buying is a single-print, so what you're saying is correct. If something's gone wrong, you can re-print as many times as needed, but once the product is complete, then your print is done.

But that's nothing to do with the file format though right? I mean, it's just the end user has to be honest no?

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