Fiber optic are currently so cheap that they are being used in expendable, single use applications in the Russia/Ukraine war in spools of 50+km.

You're talking about achieving highly marginal gains in product quality at the expense of having to launch into space literally every single part of the production process and recover it from space.

Which includes things like "ruggedizing what you launch so it can survive the launch" and "also ruggedizing it to survive the landing".