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Different countries have reached different legal precedents about what happens then. But Internet Service Providers want Netflix to pay them for the extra traffic, despite that traffic being actually a demand of you as a consumer, already paid on your monthly bill. You want to watch Netflix, Netflix pays CDN's, CDN's have peering agreements with Internet Service Providers. For instance, you, as consumer, is already paying for internet service. Traffic between CDN's and Internet providers who make last mile service is a more thorny issue, as the Netflix - Comcast dispute demonstrate. But if you need to use my network much more than i need to use yours, either you pay me for the privilege, or i optimize my trafic or the trafic from paying parties above yours on my network. Usually, between CDN's, if the data transfer is roughly equal between two parties, there isn't much issue, and a simple peerage agreement means no one has to spend money - i give you way on my network, you give me way on yours. Different providers have different peering agreements with many CDN's, allowing data to be transfered from a network to another. You see, while Riot has its own servers, and you have your own computer, there's many different entities that make the connection between the two. Steam has a bigger wallet, and can afford to pay more, getting service from larger and better optimized CDNs (Content Delivery Networks) that actually make peering agreements between each other and with different internet providers.
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