If you're licensing a patent to others with reasonable terms, it's not a patent troll.
I understand you think they provide a service since you seem to not understand what a patent troll is.
As a reminder, a patent troll company is a company "that attempts to enforce patent rights against accused infringers far beyond the patent's actual value or contribution to the prior art" (https://en.wikipedia.org/wiki/Patent_troll)
They don't sell any services, don't do any (reasonable) licensing, nor provide any goods.
