Assuming that dark fiber is actually dark (without amplifiers/repeaters), I'd wonder how they'd justify the 4 orders of magnitude (99.99%!) profit margin on sai

Assuming that dark fiber is actually dark (without amplifiers/repeaters), I'd wonder how they'd justify the 4 orders of magnitude (99.99%!) profit margin on said fiber. That already includes one order of magnitude between the 12th-of-a-ribbon clad-fiber and opportunistically (when someone already digs the ground up) buried speed pipe with 144-core cable.