Landknappers or marshsknappers ?

What shall we call them?

First you take public lands, then you exact concessions to give them back. But, from where I sit, it’s still extortion.

There’s a long history of squatters claiming presumptive easements and getting away with it. It’s one of the risks of absentee ownership. If the squatters have made “improvements,” the courts are inclined to grant them property rights.
Presumably, that’s not the case with the so-called “fishing village” that’s been operating with the landlord’s permission but no apparent building permits or business licenses.