100% of respondents to the poll claim to be sharing.

I am not trying to be very pessimistic here but I would suggest that it would be better to work from the idea that maybe 10% of users regularly share nearly all of the files that they have - and let optimism raise the number from there.
I present for sharing a certain number of completely unique files which are extremely popular - they have been downloaded in 1,000s - When I do a search for these same files the returns are very small, if any! (Although I did one time have 112 hits on them!)
But, there is no way to make any positive changes with any client that involves denying freeloaders - Any law that was strongly introduced would have the effect of damaging the network as a whole.
It is something which must simply be accepted as part of normal human behaviour. It must also be accepted that this is an argument which is mostly based on emotion and a feeling of unfairness.
Better to just get on with it all and shift some IT, right?
Don't fret

__________________
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Tomorrow's forecast:
Sunni in places, Shi'ite in others...