It's somewhat ad hoc. Generally you'll want to find who owns the actual infrastructure, and get as close to an agreement with them as possible. I.E. There will

It's somewhat ad hoc. Generally you'll want to find who owns the actual infrastructure, and get as close to an agreement with them as possible. I.E. There will be some huge Zayo fiber that is resold by a bunch of different carriers. They are B2B only and don't sell directly to end users and have fairly high minimum commitments. Find the closest point that you can connect to it, and do wireless from that point outwards. Or you can do an interconnect/backhaul type agreement (L3 used to be great at these before they were acquired by Clink). This is where you are only buying a link back to a colocation. From there you can do direct peering or pick from several transit providers at pricing you can only get in that sort of environment. Fundamentally the problem is: If the fiber is there, then likely you'll have 50 carriers all reselling it and you are just number 51. If the fiber isn't there, then you'll have a difficult time providing suitable bandwidth.