Even if they have dark or underutilized fiber it doesn't mean that it's a 0 expenditure. So you don't have to rip up the street, but optics are pretty expensive

Even if they have dark or underutilized fiber it doesn't mean that it's a 0 expenditure. So you don't have to rip up the street, but optics are pretty expensive. That's not even counting a need for new switches if it's not 1 Gbps capable.