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DSL doesn't share access locally so you don't share bandwidth until you get into the switching hardware at the phone company. At that point you do in fact share bandwidth. The DSL companies are looking to make money. If, for instance, they have a 30Mbps pipe to the internet and have 30 customers using their service, then each one will have an average of 1 Mbps to themselves. But they may figure that on average, only half their users are online at one time. So they sign up 60 customers to share that 30mbps pipe. When their estimates are incorrect and 45 people are online at once, you still inevitably end up sharing the ISP's pipe to the internet. In reality the scale is much larger than that but you get the point. You don't just magically play with packets and squeeze out more bandwidth, you end up hitting a limit.
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