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I'm aware, that's why I checked a few to make sure these actually scale well.

Normally when you make a logo bigger, you'll increase the level of detail, and tweak line widths.

(aside: These guys sound like Deep #800080 don't they?)

I don't know if this icon set provides this, but there's no reason SVG can't provide different levels of detail for different scaling factors.

Yes. Line art can be tough to scale properly.