I don't think anyone has the answer to this...
but it really it is the same concept, the only difference is the scale...
some people bring up the argument that it's legal in the physical world because only one person can use it at a time, but so what if lets say someone ran a tube site that allowed only one viewer to watch a given movie at a time? In that case there is one "copy" of the work, and only one person can enjoy it a time, making it no different than sharing physical media?
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