Was a fiber tech, they do not. It works for them because the cable is lowly buried, largely completely non functional steady light, disturbed by deformation. Most cables run parallel to existing infrastructure. Light is used instead of electricity, there is no processing capacity within the lines, only repeaters have that ability, and in the conus, runs are typically not long enough to require them, as they can run depending on conditions, 40 to 60 miles without needing a repeater. Now whether your neighbor’s ring camera or not is carrying data of you shitting on his lawn over the line, that’s another thing.