How on earth can anybody know that revenue of the full porn industry declined by 90%
The small home based companies don't keep books and don't pay tax
the medium size companies keep double books and pay little tax
the big ones all work with some kind of offshore solution
The Russian tubes and filelockers don't pay any tax at all
If he means that the US tax dept receives 90% less from the porn industry than 10 years ago, yes that would make sense
