So are S&P/Moody ratings yet those got us in trouble in 2008. Just because something is a universal practice in the financial industry doesn't absolve it from conflicts / potential legalities.
What's the point of this "fun fact"? I guess the implication you're trying to make is that PFOF is bad by association with maddoff. It's easy to see the flaw with this logic, eg. the autobahn was "pioneered" by hitler, therefore it's bad.