How much would 1k 100GbE links cost from one of those providers? How much would 10k of those links cost? Does the price increase linearly or exponentially?
If you need multiple 100GbE transit connections from ISPs larger than yourself, in multiple locations, you most likely also are a fair sized ISP, so the situation is very different because you'll also be purchasing a variety of transport (point to point circuits) between cities at 100/200/400GbE capacity, various DWDM circuits, lighting your own dark fiber, etc. It's a whole other ball game.
It will be linear until you reach a percentage of the capacity of the provider themselves. Not every company has multiple terabits into each datacenter.
At that point you’re probably buying dark fiber to get where you need to go.
