I saw a tent and it looked like someone had camped on the island overnight
I heard that some people live in it. Even in the USA. This is one way to avoid having to pay rent. If someone is living a simple, minimalist life, then this sounds like a good way to live.
YEs that could be the case, I think it was someone temporarily staying there o the island in this case, maybe out there fishing late at night or early morning and camped there