http://www.businesskorea.co.kr/news/articleView.html?idxno=8...
https://blog.cloudflare.com/bandwidth-costs-around-the-world...Both links talk about SK regulations, the latter more directly:
> This may be driven by new regulations from the Ministry of Science, ICT and Future Planning, which mandate the commercial terms of domestic interconnection, based on predetermined “Tiers” of participating networks
It could be a miscommunication but you’re being a little unclear with your language. If you’re saying that the $/TB is $0 then you’re not strictly true everywhere. Additionally, even if peering is 0-rated between large cloud providers, it isn’t necessarily true for Vimeo if they’re a customer. It depends on the agreements they’re able to strike with their providers, or the terms they’re able to get for their own peering agreements (even if large cloud providers 0-rate each other’s traffic, they may not do so for smaller customers).
If you’re saying that costs are variable based on how many TB you transfer I can’t say, but practically I doubt it would matter. But the contract can state that peering is charged $x/TB above the Y TB included in your annual minimum spend of Z hundreds of dollars.
Of course amortized over Vimeo’s volume this (wildly speculating on my part) probably amounts to several dollars per month or even per year and most of their customers are unlikely to be in SK or Australia where this issue is most prevalent. So in practice most businesses do often see 0-rated transit costs.
Disclaimer: this all my secondary hand information and I’m not particularly knowledgeable in this space. I would defer to anyone who actually strikes these peering deals regularly.