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The plan for nationwide fiber internet might be upended for Starlink
(www.theverge.com)
This is a most excellent place for technology news and articles.
Microwave point-to-point radios are fastest because they travel through air, but more importantly, are typically the shortest path possible by line-of-sight.
Being 66.7% of speed of light doesn't matter terribly when you consider that the cable path is shorter by more than 66.7% of path taken by satelite link.