Lee Cheng, Chief Legal Officer of online retailer Newegg, said:
“A troll is a type of entity that doesn’t sell a product, or transfer value of any sort. All they offer is the right to not be sued. It’s protection money. To put it bluntly, it’s extortion.” (source)
Righthaven produced nothing but lawsuits. The term is properly applied to them. Porn companies, record companies, and other companies trying to stop infringement, or trying to recoup losses from infringement are not properly so-labeled.