Well, not a scam in the sense of a con-artist setting out to liberate gullible people from their money but I get your point. It's more like desperate people fooling themselves that they're doing okay when they're really just a new form of transient poor, the educated, formerly middle-class. Would tiny homes be a thing if there were job security and housing costs reflected income? I think not. What really, really gets on my **** about tiny home owners is that they convince themselves that they're not moochers what they park up in friends and strangers properties, rely on their utilities, and "borrow" all the useful paraphernalia other people have to store while convincing themselves that they're making an even exchange with a bit of lawn mowing and whatnot. They are neither a self-contained household nor an interdependent community.
The irony of course is that as crap as caravans/mobile homes can be they're much better planned and laid out than tiny homes, but there's a deeply classist sentiment separating the two populations. Not that I want to live in some sort of urban dystopia (I make my living consulting on and/or renovating listed building), but a dense city like New York has a much lighter footprint that the equivalent population spread out. I think of tiny houses as a phase some people need to go through, a bit like playing house, actually, just like playing house. Sadly, at the other end of the phase many people will need to accept that the movement wouldn't exist if there was decent affordable housing near decent, secure employment.