Do they not? Although they live on a sailboat, they have to pay docking fees when at port. They are vegan, so they have to buy farmed food while at port, they can’t fish for it. They have to pay taxes like everyone else. They pay for hosting for their web presence. Their boat requires maintenance, so they occasionally have to buy materials for this which are industrially produced. They have to earn an income to fund all of these expenses.
Just because they get power from a solar panel and can sail to different places doesn’t mean they are “outside the system”. They are just living an unusual lifestyle with a light footprint. They still have a number of obligations to attend to. In fact, some of these obligations (particularly the ones related to the boat) are life-or-death, and much worse than what the average person deals with. You can’t hire a handyman to come patch your boat up during a storm.
They have an extremely large network of friends and supporters, and they often mention the people they meet while at marinas. People who live on the water have each other as neighbors.
It’s similar to people who live in their RVs full time. When they park somewhere (often for months) they have local neighbors and meet people. They may often meet the same people later in a different location.
Or you could think of them like long haul truckers, who have friends at their end stops but spend a lot of time traveling. Surely those people live in a society? What about salespeople who constantly travel between a few cities in a region? Or UK longboat dwellers? Bedouins?
Nomadic lifestyles, of one kind or another, have been a part of human history since the beginning.
Regardless, I’m not sure what your complaint is. Care to spell it out in a little more detail for me? You seem to think they don’t interact with people, but that’s not the case.
Just because they get power from a solar panel and can sail to different places doesn’t mean they are “outside the system”. They are just living an unusual lifestyle with a light footprint. They still have a number of obligations to attend to. In fact, some of these obligations (particularly the ones related to the boat) are life-or-death, and much worse than what the average person deals with. You can’t hire a handyman to come patch your boat up during a storm.