Ironically, they have begun levying taxes. Or “tithes” as they prefer to say.
What began as an earnest protest, and journeys downriver to avoid the tollbooth on the very road they had helped preserve and protect, has ended as do all journeys towards regional importance.
The thing about protecting places is that it inevitably costs money – a militia, walls, wells, equipment. And if you, the ruler, pay for it all out-of-pocket, you might create enough inflationary pressure that monsters become a lesser concern. The dragons, they could deal with. The forces of macroeconomics not so much.
So the Righteous Tax Evaders are in the process of quietly burying their old moniker, much aided by the fact that until recently – despite all their giant- and undead-slaying – no one had really known who they were.
One could say they are disgruntled, but above all, they are realists.