The world may never know.
(Alternate answer: Probably about as many who would like to be
internet-intensive but are stuck with dial-up.)
I would guess that another reason for the limit, besides the issues raised already, is so that people can't upload an entire episode at one go. No, it probably doesn't help much, but I imagine the lawyers feel a little happier.
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“There must have been a point in early human history when it was actually advantageous to, when confronted with a difficult task, drop it altogether and go do something more fun, because I do that way too often for it to be anything but instinct.” -- Isto Combs