I can’t remember where I read it, but there was an article in high finance tech, where they were dealing with billions of transactions per second and relied on sub-millisecond timing. They still used terrestrial long-haul (cross-continent) microwave tower networks for this because even the time it took to transceive between optics and electrons in each switching segment meant fiber was slower. The latency tolerance for those applications preclude the drive up and down to space.