Off-grid is the only one that has strong potential to be a permanent lifestyle. I don't see myself living on a boat or in a van when I'm old. It does interest me while I'm young though, but it's not feasible for most people. Many of these people are living off money from social media, savings, or other sources of income that the average person doesn't have. Although it doesn't take much money to live in a van if you make sure you never pay for places to camp.
I'll add that free-spirited van lifer types were living the dream prior to the pandemic. Then, corona virus hit and the hippie-hipster-man-bun-wearing-van-life community started freaking out, with many couples breaking down emotionally, and retrograding back home:
Not the type of soft paper tiger community I would want to be associated with.