What about them? Just doing a brief run-through of their history, the only thing that sticks out that might pertain to this conversation is that they have no sales or income tax.

If this is why you mention them, what does that have to do with this topic?

Edited to add:

Before anyone gets too excited over the idea of moving to the Pitcairn Islands so they don't have to pay income or sales tax, please note they have civil conscription. That means citizens must work (for free), doing things like digging ditches or building roads or whatever else needs to be done to build and maintain the infrastructure on the island.

That's not remotely similar to what the Sovereign Citizens Movement is about.