Further more, why would someone choose this over $59.69 a pair fiber ether net media converter, up to 20KM, 1000Mbps from TP-LINK? There are most likely cheaper options from other vendors.
There are actually different models have laser trans-receivers built in with same or might even cheaper price. So unless there are very special requirements, I don't really see a reason to go for those.
https://www.aliexpress.com/item/1005001435649462.html